Fixes #18582 - add missing id params to taxonomy apidoc

Fixes #17272 - Fixed Searches on parameters with !=

Fixes #18426 - Add actions to notification entries

This adds support for the notifications to display actions. In case no
actions are provided, the dropdown kebab isn't shown. The actions
possible right now only include GET links.

Fixes #17228 - Select templates as global defaults (#4283)

This should allow user to select templates that will be used
for building PXE Default on TFTP proxy. These templates will
not be updated from seeds during updates.

fixes #17866 - Remove PXE Properties from Gentoo Operatingsystem

The Gentoo Operatingsystem cannot be installed via PXE and can only be provisioned via Image.

Implementing the pxe method causes the exception as described in #[17866](http://projects.theforeman.org/issues/17866)....

Fixes #16982 - Scope properly when no taxonomies are set

The default scope for hosts and other objects did not restrict
properly by taxonomies. An user without organizations or
locations, could do anything it's permissions allow to.
The list of hosts was unrestricted and showed hosts in...

Refs #18554 - Revert cache removal

This reverts commit 23b60a176974307244665c1c190424d5667a2ccc.

Fixes #18554 - skip collection_cache_lookup on authorized_for

The call to `authorized_for` can take multiple seconds in some cases,
leading to performance issues.

This patch will bypass the cache lookup, resulting in similar times for
admins and non-admins when viewing pages with lots of hosts.

fixes #17533 - provision dhcp for bond child macs

fixes #18574 - add ip6 address to the REST api results