feat(formulas): replace EOL pre-salted images

* Based on the discussions in the following merged PR:
  - saltstack-formulas/template-formula#148
* Applied changes to all relevant formulas except the `ufw-formula`:
  - Some underlying problem there causing failures
  - Perhaps related to still needing to use `dist: trusty` (Travis)

ssf/defaults.yaml

@@ -14,8 +14,8 @@ ssf_node_anchors:
             #       release phase via. `pre-commit_semantic-release.sh`
             #       An alternative method could be to use:
             #       `git describe --abbrev=0 --tags`
-            title: 'fix(yamllint): use separate suite for `ubuntu`'
-            body: '* Semi-automated using https://github.com/myii/ssf-formula/pull/18'
+            title: 'ci(kitchen+travis): replace EOL pre-salted images'
+            body: '* Automated using https://github.com/myii/ssf-formula/pull/16'
           github:
             owner: saltstack-formulas
             repo: ''