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 #18252 - added docker* to ignore

Ignore docker* by default in ignored_interface_identifiers

Fixes #17330 - skip admin email if it's unknown

When admin user is being seeded the Setting might not exist at that
moment. We can't just create it with value, since the setting would
be invalid because of other attributes. Therefore we split settings
creation from the setting list so we could create it from seed too....

Fixes #6006 - Add options to disable updates from facts

Add option ignore_facts_for_operatingsystem:
    do not update system's operating system based on facts
  Add option ignore_facts_for_domain:
    do not update system's domain based on facts

Fixes #12156 - Adds email configuration into Foreman settings

Instead using email.yaml, the email configuration
can be modified dynamically via settings.

fixes #17095 - ensure subnet belongs to ip from facts

Fixes #1556, #11615 - Remove puppet rdoc support

Puppet rdoc support has been broken for a long time. Removing it from
Foreman.

Fixes #17296 - Add setting access_unattended_without_build

Fixes #14688 - Power status visible on hosts index page

fixes #7152 - translate setting category names