perf(travis): improve salt-lint invocation [skip ci]

* Automated using myii/ssf-formula#90

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a packager
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.kitchen
+.kitchen.local.yml
+kitchen.local.yml
+junit-*.xml
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# dotenv
+.env
+
+# virtualenv
+.venv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
+# Bundler
+Gemfile.lock
+
+# copied `.md` files used for conversion to `.rst` using `m2r`
+docs/*.md
+
+# Vim
+*.sw?
+
+## Collected when centralising formulas (check and sort)
+# `collectd-formula`
+.pytest_cache/
+/.idea/
+Dockerfile.*_*
+ignore/
+tmp/

.rubocop.yml

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+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+# General overrides used across formulas in the org
+Metrics/LineLength:
+  # Increase from default of `80`
+  # Based on https://github.com/PyCQA/flake8-bugbear#opinionated-warnings (`B950`)
+  Max: 88
+
+# Any offenses that should be fixed, e.g. collected via. `rubocop --auto-gen-config`

.salt-lint

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+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+exclude_paths: []
+rules: {}
+skip_list:
+  # Using `salt-lint` for linting other files as well, such as Jinja macros/templates
+  - 205  # Use ".sls" as a Salt State file extension
+  # Skipping `207` and `208` because `210` is sufficient, at least for the time-being
+  # I.e. Allows 3-digit unquoted codes to still be used, such as `644` and `755`
+  - 207  # File modes should always be encapsulated in quotation marks
+  - 208  # File modes should always contain a leading zero
+tags: []
+verbosity: 1

.travis.yml

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+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+## Machine config
+dist: bionic
+sudo: required
+services:
+  - docker
+
+## Language and cache config
+language: ruby
+cache: bundler
+
+## Script to run for the test stage
+script:
+  - bin/kitchen verify "${INSTANCE}"
+
+## Stages and jobs matrix
+stages:
+  - test
+  - name: release
+    if: branch = master AND type != pull_request
+jobs:
+  include:
+    ## Define the test stage that runs the linters (and testing matrix, if applicable)
+
+    # Run all of the linters in a single job
+    - language: node_js
+      node_js: lts/*
+      env: Lint
+      name: 'Lint: salt-lint, yamllint, rubocop & commitlint'
+      before_install: skip
+      script:
+        # Install and run `salt-lint`
+        - pip install --user salt-lint
+        - git ls-files | grep '\.sls$\|\.jinja$\|\.j2$\|\.tmpl$\|\.tst$'
+                       | xargs salt-lint
+        # Install and run `yamllint`
+        # Need at least `v1.17.0` for the `yaml-files` setting
+        - pip install --user yamllint>=1.17.0
+        - yamllint -s .
+        # Install and run `rubocop`
+        - gem install rubocop
+        - rubocop -d
+        # Install and run `commitlint`
+        - npm i -D @commitlint/config-conventional
+                   @commitlint/travis-cli
+        - commitlint-travis
+
+    ## Define the rest of the matrix based on Kitchen testing
+    # Make sure the instances listed below match up with
+    # the `platforms` defined in `kitchen.yml`
+    - env: INSTANCE=default-centos-8-master-py3
+    - env: INSTANCE=default-fedora-31-master-py3
+    # - env: INSTANCE=default-amazonlinux-2-master-py2
+    # - env: INSTANCE=default-centos-8-2019-2-py3
+    # - env: INSTANCE=default-fedora-31-2019-2-py3
+    - env: INSTANCE=default-amazonlinux-2-2019-2-py2
+    - env: INSTANCE=default-centos-7-2019-2-py2
+    - env: INSTANCE=default-fedora-30-2018-3-py3
+    # - env: INSTANCE=default-centos-7-2018-3-py2
+    # - env: INSTANCE=default-amazonlinux-2-2018-3-py2
+    - env: INSTANCE=default-centos-6-2017-7-py2
+    # - env: INSTANCE=default-fedora-30-2017-7-py2
+    # - env: INSTANCE=default-amazonlinux-2-2017-7-py2
+
+    ## Define the release stage that runs `semantic-release`
+    - stage: release
+      language: node_js
+      node_js: lts/*
+      env: Release
+      name: 'Run semantic-release inc. file updates to AUTHORS, CHANGELOG & FORMULA'
+      before_install: skip
+      script:
+        # Update `AUTHORS.md`
+        - export MAINTAINER_TOKEN=${GH_TOKEN}
+        - go get github.com/myii/maintainer
+        - maintainer contributor
+
+        # Install all dependencies required for `semantic-release`
+        - npm i -D @semantic-release/changelog@3
+                   @semantic-release/exec@3
+                   @semantic-release/git@7
+      deploy:
+        provider: script
+        skip_cleanup: true
+        script:
+          # Run `semantic-release`
+          - npx semantic-release@15

.yamllint

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+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+# Extend the `default` configuration provided by `yamllint`
+extends: default
+
+# Files to ignore completely
+# 1. All YAML files under directory `node_modules/`, introduced during the Travis run
+# 2. Any SLS files under directory `test/`, which are actually state files
+# 3. Any YAML files under directory `.kitchen/`, introduced during local testing
+ignore: |
+  node_modules/
+  test/**/states/**/*.sls
+  .kitchen/
+
+yaml-files:
+  # Default settings
+  - '*.yaml'
+  - '*.yml'
+  - .salt-lint
+  - .yamllint
+  # SaltStack Formulas additional settings
+  - '*.example'
+  - test/**/*.sls
+
+rules:
+  empty-values:
+    forbid-in-block-mappings: true
+    forbid-in-flow-mappings: true
+  line-length:
+    # Increase from default of `80`
+    # Based on https://github.com/PyCQA/flake8-bugbear#opinionated-warnings (`B950`)
+    max: 88
+  octal-values:
+    forbid-implicit-octal: true
+    forbid-explicit-octal: true

Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gem 'kitchen-docker', '>= 2.9'
+gem 'kitchen-inspec', '>= 1.1'
+gem 'kitchen-salt', '>= 0.6.0'

bin/kitchen

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'kitchen' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require 'pathname'
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile',
+                                           Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path('bundle', __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort(
+      'Your `bin/bundle` was not generated by Bundler, '\
+      'so this binstub cannot run.  Replace `bin/bundle` by running '\
+      '`bundle binstubs bundler --force`, then run this command again.'
+    )
+  end
+end
+
+require 'rubygems'
+require 'bundler/setup'
+
+load Gem.bin_path('test-kitchen', 'kitchen')

commitlint.config.js

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+module.exports = {
+    extends: ['@commitlint/config-conventional'],
+};