Fixes #11035 - template preview feature

(cherry picked from commit de9e7adaa579db01d043d6a04a83c946a3d33850)

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

(cherry picked from commit 674755f43684f76e6b23ca499a57153aad3db5e2)

Fixes #10635 - Formalize deprecation warning

(cherry picked from commit 319d1ffbed54f2c9eb988d132ec1586fb4d7c428)

Fixes #10607 - match bonds based on identifier only

(cherry picked from commit 7be20b248502eb8682008e1c6b03fef71da4f73d)

Fixes #10888 - skip attached_to updates if identifier was blank

(cherry picked from commit db6d6b8b7d0d2e90e27d4c23308e5db26abd3820)

Fixes #10633 - Associate architechture to OS during fact import

fixes #10861 - Remove unused columns from the hosts table

• Serial - Never really used, probably can be refactored as kernel
  parameters.
• last_freshcheck, source_file_id - left overs from puppet old store
  configs compatibility that we no longer use, I assume no one is using...

fixes #10627 - apply host taxonomy scope to facts/report joins

Previous changes to perform a join onto hosts with authorisation result
in a query such as Report.joins(:hosts), which ignores any
default_scope on Host::Base. This commit explicitly passes taxonomy...

Fixes #10713 - improved backtrace logging

• full trace in 500 page in production shows really the full trace
• Foreman::Logging.exception as an unified entry point for exceptions logging
• the backtrace cleaner doesn't delete the plugins
• the orchestration exceptions gets the backtrace covered by logger...

Fixes #7096 - Adds STI to templates

This commit converts Ptables to be just another type of Template so it
gets the same features as ConfigTemplate. ConfigTemplate was renamed to
ProvisioningTemplate to reflect UI and the name under it's commonly known.