Fixes #8400: Remove eager loading of puppetclass in lookup_keys index
Fixes #8401: n+1 query on group parameters host edit

Hostgroup tries to eager load the group parameters but there's an error
in the code that renders the eager loading useless.
Fixes #7032 - Rake backup accepts destination file
refs #7032 - fix documented backup filename
Fixes #8551 - use most specific matcher for inherited hostgroups

Host recieves correct smart_class_parameter value when multiple overrides for
inherited host groups exist for parameter.
Fixes #8416 - Fix Puppet classes form n+1 queries
fixes #8592 - allow plug-ins to modify multiple hosts actions

Refactoring patern: Extract method.
fixes #8590 - handle missing 'config' when listing vSphere VMs
fixes #8591 - explicitly set where to subnets.id
fixes #8477 - usability improvements to template locking/defaults
refs #8477 - fix string interpolation and spelling
Fixes #8620 - Remove useless back to host index link in multiple hosts action
fixes #8627 - add host comment field to API documentation
Fixes #2592 - No indication when waiting for host dashboard button action to complete
Refs #8364 - removed javascript N+1 alerts