Sync templates

Fixes #23210 - Handle PuppetCA tokens

In a new SmartProxy PuppetCA autosigning variant
tokens get returned that need to be provisioned on
the host.

Fixes #24633 - Add uniqueness to puppet class name (#6019)

Fixes #19790 - Fix Layout/SpaceBeforeBlockBraces cop

fixes #1459 - ipxe provisioning support

Fixes #22611 - Adapt DB migrations for Rails 5.2

Fixes #24546 - add uniq constraint on subnet.name

Concurrent requests on subnet create can lead to duplicate records. This
is calling issues in production when bulk importing hosts from the same
subnet via user scripting.

Fixes #21938 - add plugable upgrade rake task

This commit adds the ability for upgrade rake tasks to be defined
within seeds. The installer can then run the upgrade:run rake task
to run them. Tasks can be defined to run once or to always run when
the upgrade:run master task is run.

Fixes #24381 - Remove modulepath setting

This setting was used by the puppetclasses support but as part of
b1dad4cd18dfc69faa8f1509b0b5b9a361976d59 that code has been removed.
This setting is now useless.

Refs #24640 - Cast omitted default with merge_overrides

In case the default value is omitted and the merge_override option is
selcted, the previous version of this migration didn't cast the default
leading to a failure when merging overrides.
Error message was also improved to be clearer and less frightening than...