fixes #17545 - adds UI notification support

- Initial data model for notification support, based on manageiq design.
- addes notification JSON endpoints.

Fixes #6502 - List ignored classes and environments on import

When importing environments and classes from puppet, ignored
environments and classes defined in ignored_environments.yml
aren't aparent.

This will add them to the list to import as ignored and...

Fixes #6952 - Set hostgroup after provisioning from pxe

After hostgroup provisioning, when the machine has registered
with foreman, it should be in the same hostgroup.
to achieve this behavier, the fact foreman_hostgroup should be
added to hostgroup provisioning template

Fixes #16740 - Access host params through macro

Fixes #17894 - load needed dependent api param group

when rendering facet api param docs

Fixes #17874 - Extract contains_erb? from lookup key

fixes #17853 - resolve ips in interface scope

Fixes #17015 - Adds Key pairs controller

Fixes #17632 - Reports widget will not fail on ambiguous filter

A user with a filter on a joined table that has a host_id column (such
as nics for example) will cause the report widget to break due to an
ambiguous column name. This fix makes sure the columns use the table...

fixes #16459 - remove 1.15 deprecations