Fixes #17361 - ensure plugins migration paths are set

fixes #16557 - move tests into modern Rails layout

Models, controllers, mailers and helpers are now in test/ subdirs
matching app/ subdirs. Service, miscellaneous and old test/lib/ tests
are now in test/unit/ separated from models, which obsoletes the custom...

Fixes #16565 - Correct host search by parameters

Overrides for parameters values caused incorrect results for when
searching by parameter value. This commit fixes those results, and
improves the handling of parameter priorities in general. A new rake
task, `parameters:reset_priorities` is introduced that should be invoked...

fixes #16529 - require rake/testtask explicitly

Fixes #12634 - New HW Model flag pxe_loader

Implementation of

https://github.com/theforeman/rfcs/blob/master/text/0001-PXE-Booting-UEFI.md

In short, new host/hostgroup flag PXE loader is added to specify TFTP
DHCP filename and Foreman now orchestrates all PXE-capable templates...

fixes #16046 - run webpack:compile as pre-req to test rake tasks

The webpack:compile task is now run before all rake test tasks,
including jenkins:*. Except for jenkins:integration, a failure in
webpack:compile is issued as a warning as unit tests don't require...

Refs #12193 - Remove remaining cached counters

Fixes #12193 - Stop using counter_cache for host[group] counts

This is aimed to prevent deadlocks caused by Rails' implementation of
counter_cache that is hit when multiple hosts are created or updated at
the same time. An added benefit is that the counters will now display...

fixes #13845 - remove 1.13 deprecations

Fixes #15439 - improved error reporting for media