Fixes #11704 - consider no reports as warning if reports are expected

Fixes #11688: default text editor to ruby.

Instead of defaulting to text, default to ruby syntax highlighting.

http://projects.theforeman.org/issues/11688

fixes #11610 - removing a bunch of N+1 queries from the migration

fixes #11473 - remove re-init of domain select2 on env selection

After an environment was selected, the reloadOnAjaxComplete function
re-initialised every select2, but other dropdowns triggered
onContentLoad which excluded those with the without_select class....

fixes #8521 - fix classes accessors, copy overrides on host clone

The various 'classes' accessors that are used in the UI for displaying
the Puppet classes tab only really worked for saved objects, so they're
changed to work better on an unsaved cloned object. Tests now check...

fixes #10589 - removing N+1 queries from after_save callbacks when changing hostgroup

refs #11738 - fix incorrect capitalisation and host group wording

fixes #11738 - add missing punctuation to provisioning template view

Fixes #11621 - n+1 query on User Groups index

fixes #9108 - parent parameters are now overrideable