Fixes #17681 - Switch to newly created taxonomy

Fixes #17872 - Update button label from New to Create

Based on PatternFly Terminology and Wording suggestions
Don't recommend to use New, so update New to Create.

fixes #18214 - accept `params` as AC::Parameters or Hash

In Rails 5, ActionController::Parameters no longer inherits from Hash
and so type checks for params.is_a?(Hash) now return false and should
accept either. (Rails commit 14a3bd5.)

fixes #18208 - replace audited-activerecord with audited (#4218)

Refs #17653 - fix typo in show_hidden_parameters and add tests

Fixes #16752 - Extract template code from Host::Managed

Host::Managed contains a lot of code related with determining the
template that a host should have. Other Host objects such as
Host::Discovered might need that logic, without becoming a
Host::Managed....

Fixes #12649 - Index search not retained on cancel click

On pages puppet classes and host group, index search is not
retained on form's cancel click.
Added cancel_path_with_index_search method
in file application_helper.rb

fixes #18176 - replace clear_association_cache with reload

Reload is still necessary in Rails 5 as interfaces association will be
cached. The BMC test change is necessary to reload smart proxies
associated to the subnet after their features were altered - previously...

Refs #17653 - add show_hidden to apidoc

fixes #18157 - use AS::Duration division to get days from expiry

ActiveSupport::Duration#parts was an unreliable API as it contains data
used internally when constructing durations.