Refs #3809 - Stabby lambda syntax for oneliners

I started by spotting log.rb which didn't have a lambda wrapping its
default scope, as needed by Rails 4. Since the style guide and most
Rails 4 documents used the stabby lambda, I turned on the cop so that we...

Fixes #11031 - ignore identifiers of interfaces being destroyed

Fixes #1453 - add use_image and jumpstart helpers to Host jail

Fixes #9591 - Added support for "inherit" state.

Refs #3809 - Enable cop Style/IfUnlessModifier

Fixes #11035 - template preview feature

Fixes #10915 - Deleting a host removes all host specific overrides

Fixes #10635 - Formalize deprecation warning

Fixes #10607 - match bonds based on identifier only

Fixes #10888 - skip attached_to updates if identifier was blank