Fixes #19213 - use provision interface in foreman_url

Before this patch, we were using primary interface for checking on ftfp
proxy and its template feature. Provision interface is more appropriate
for this purposes.

(cherry picked from commit 778d8bcbc08f790aae8ed2abb9637ab880804275)

refs #18760 - exclude test routes from permission checks

Running test/controllers/concerns/csv_responder_test.rb and
access_permissions_test in sequence (e.g. in `rake test`) would cause
failures against the "fake" routes introduced by CsvResponderTest as no...

Fixes #18345 - Improve templates error handling

fixes #18735 - truncate encryption key to match preferred length (#4350)

Ruby 2.4's OpenSSL bindings raise an ArgumentError during encryption if
the key length exceeds the cipher's configured length (32 bytes with the
default cipher), but the verification hash algorithm still uses the full...

Fixes #18581 - conditionalize SUSE mediapath

Fixes #18227 - clean up variables after rendering

Fixes #18205 - Add save_to_file macro

Refs #18143 - extend snippet_if_exists too

Fixes #18143 - enable variables for snippets (#4205)

Fixes #17680 - templates_used host helper

templates_used contains the names of all of the provisioning templates
kickstart used during a host build. This allows users to be able to
show the name of a provisioning template during PXEBoot, for example