Fixes #2314 - fine grain for RAM selectors

Fixes #16318 - PXE templates now work in safemode (#3783)

pxe_kernel_options added to safemode

Fixes #16057 - added dns_lookup template helper

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...

fixes #15863 - add short session or request ID to logs

New middleware stores the session and request IDs (either from
X-Request-ID or a UUID generated by Rails) in the logger's thread
storage. The truncated session ID is now logged by default to minimise...

Refs #3809 - Using defaults for AndOr cop

fixes #15751 - replace spork with spring in development

To make use of it, run bin/rails and bin/rake rather than plain
rails or rake commands, and run `spring status` or `spring stop` to
check and stop current background processes.

Test log removal has moved to the logging framework as the file would...

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...