Rework 2.x RBAC generators

[rainest]

What this PR does / why we need it:

• Adds configurable RBAC verbs for generated controllers' kubebuilder RBAC annotations.
• Adds RBAC-only API configuration to the controller generator.
• Adds a namespaced Role duplicate of the ClusterRole.
• Updates permissions to align with KIC 1.x permissions

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #1215

Special notes for your reviewer:

• RBAC-only API generation is perhaps a bit out of place in its current home (railgun/hack/generators/controllers/networking/main.go) as they aren't controllers, but there isn't an obvious better place to place it already. This at least provides a single location to configure both types of things that generate RBAC permissions.
• The status and finalizer permissions have been left as-is, with no new toggles to disable them. Wasn't sure if we wanted to remove them from anything (1.x only had status on Ingress-likes, but AFAIK we intend to expand on what 1.x did).
• The addition of the namespaced Role will place a resource we don't want in role.yaml. We will need to split it out and select only the ClusterRole when building the all-in-one manifests.

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[github-actions]

Licenses differ between commit 66977e7fb964aaa0d78b7ea98368afae7872701c and base:

+++ pr_licenses.csv	2021-06-24 21:17:34.567611297 +0000
@@ -1,3 +1,6 @@
+github.com/Masterminds/goutils,https://github.com/Masterminds/goutils/blob/master/LICENSE.txt,Apache-2.0
+github.com/Masterminds/semver,https://github.com/Masterminds/semver/blob/master/LICENSE.txt,MIT
+github.com/Masterminds/sprig,https://github.com/Masterminds/sprig/blob/master/LICENSE.txt,MIT
 github.com/beorn7/perks/quantile,https://github.com/beorn7/perks/blob/master/quantile/LICENSE,MIT
 github.com/blang/semver/v4,https://github.com/blang/semver/blob/master/v4/LICENSE,MIT
 github.com/bombsimon/logrusr,https://github.com/bombsimon/logrusr/blob/master/LICENCE,MIT
@@ -25,13 +28,16 @@
 github.com/hashicorp/golang-lru,https://github.com/hashicorp/golang-lru/blob/master/LICENSE,MPL-2.0
 github.com/hashicorp/hcl,https://github.com/hashicorp/hcl/blob/master/LICENSE,MPL-2.0
 github.com/hexops/gotextdiff,https://github.com/hexops/gotextdiff/blob/master/LICENSE,BSD-3-Clause
+github.com/huandu/xstrings,https://github.com/huandu/xstrings/blob/master/LICENSE,MIT
 github.com/imdario/mergo,https://github.com/imdario/mergo/blob/master/LICENSE,BSD-3-Clause
 github.com/json-iterator/go,https://github.com/json-iterator/go/blob/master/LICENSE,MIT
 github.com/magiconair/properties,https://github.com/magiconair/properties/blob/master/LICENSE.md,BSD-2-Clause
 github.com/mattn/go-colorable,https://github.com/mattn/go-colorable/blob/master/LICENSE,MIT
 github.com/mattn/go-isatty,https://github.com/mattn/go-isatty/blob/master/LICENSE,MIT
 github.com/matttproud/golang_protobuf_extensions/pbutil,https://github.com/matttproud/golang_protobuf_extensions/blob/master/pbutil/LICENSE,Apache-2.0
+github.com/mitchellh/copystructure,https://github.com/mitchellh/copystructure/blob/master/LICENSE,MIT
 github.com/mitchellh/mapstructure,https://github.com/mitchellh/mapstructure/blob/master/LICENSE,MIT
+github.com/mitchellh/reflectwalk,https://github.com/mitchellh/reflectwalk/blob/master/LICENSE,MIT
 github.com/modern-go/concurrent,https://github.com/modern-go/concurrent/blob/master/LICENSE,Apache-2.0
 github.com/modern-go/reflect2,https://github.com/modern-go/reflect2/blob/master/LICENSE,Apache-2.0
 github.com/pelletier/go-toml,https://github.com/pelletier/go-toml/blob/master/LICENSE,MIT```

[codecov]

Codecov Report

Merging #1457 (160284d) into next (8171d4e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #1457   +/-   ##
=======================================
  Coverage   55.79%   55.79%           
=======================================
  Files          44       44           
  Lines        3733     3733           
=======================================
  Hits         2083     2083           
  Misses       1501     1501           
  Partials      149      149           

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[shaneutt]

LGTM 👍