fixes #18695 - create test/functional/ for test:functionals task

fixes #18665 - call #to_h before comparing AC::Parameters to hash

Allows comparisons when ActionController::Parameters is separated from
Hash in Rails 5.0. #permit! is now called on inner hashes sent through
KeepParam (similar to rails/rails@e86524c in 5.1) so they are included...

refs #16982 - remove User.current deassignment (no such user)

Allows the scope change to be reverted, as User.current is no longer set
to `nil` (there is no 'admin' user).

This was relying on a bug in Ruby on Rails 4.2 where the `unscoped` call
filtered through thread variables into Subnet.subnet_for which calls...

refs #16982 - pass ID, not models into model.find

Fixes #17272 - Fixed Searches on parameters with !=

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 #18581 - conditionalize SUSE mediapath

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.