Fixes #15308 - Override validation doesn't run without changes

(cherry picked from commit 85c9be5a6ed9b593214cf3bc9de2f29960a2a25a)

templates - sync from community-templates

Fixes #14546 - ability to restrict *_external_variables
Fixes #14535 - corrects permissions for smart class parameters

Fixes #15038 - reset User cache during migration

This commit will update the cache information about columns
on the User table. This is needed due to errors observed during
certain upgrades involving the Katello plugin.

Refs #3809 - Turning on some rubocop cops

fixes #13437 - Bookmarks public attribute set to required

fixes #14661 - support IPv6 subnets

fixes #14638 - Refactor Subnet into STI to allow different subnet types

templates - sync from community-templates

Fixes #14586 - Associate default templates to Orgs and Locs during seed