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

Fixes #8343 - Consolidated code paths, and removed unnecessary DB calls for parent object

Fixes #11078 - Substitute find_all_by by where to comply with Rails 4

This commit takes away all instances up to this point of find_all_by to
improve Rails 4 compatibility. They are substituted by .where calls.

Fixes #10356 - changed the POST/PUT RABL template to be the same as the GET template

HTTP response code standardized to 201 on create.

Fixes #10438 - Removed trends:clean task, as it is no longer needed

Fixes #11025: Allow skip test runner to run through Jenkins test task.

The Jenkins CI gem implements its own custom test runner. When trying
to use a custom test runner in the jenkins environment, this test
runner needs to be inherited from and included as the last argument....

Fixes #10867 - OpenStack boot_from_volume is true only when checked

Refs #3809 - Style/blocks cop enabled

Fixes #10803: Return nil if no resource_type when creating a filter.

In some instances, such as during DB seed, when a filter is being
created for the first time the before_validation callback to
build_taxonomy_search is triggered. Since, the filter hasn't been...

Fixes #10928 - Default dashboard widgets for new users