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

fixes #11341 - update fog to 1.34.0

fixes #11415 - using the correct method for classification caster

Fixes #11683 - Fixed Hostgroup#new parameters spinner when Lifecycle selected

Fixes #11707 - skip irrelevant states in host overview