fixes #12342 - unsaved (new or cloned) hostgroups keep their puppetclasses

Unsaved hostgroups didn't respond correctly to individual_puppetclasses
because that method expects some objects to be saved in the DB. In case
of selecting a new environment, that lead to puppetclasses disappearing....

fixes #12194 - join fact tables multiple times for each search term

scoped_search usually generates a new inner join for each search term
when searching through a key/value table layout to correctly search for
hosts via multiple facts. Since the change to ext_method in 3f8e6c33, a...

Fixes #10649 - Adds Test email button to user's mail preferences

When clicked, a test mail deliverd to the user's email, and if it
failed, error details will pop up.

Fixes #12441 - validate uniqueness for nic identifier and host

fixes #12458 - escape values in fact searches to prevent SQL injection

fixes #11943 - only send built mail when host is installed

Fixes #12212 - Import addtitionnal informations from DHCP smart proxy

Fixes #12432 - Changed roles model so admin could see/attach all permissions

fixes #11771 - ensure created HostStatuses are saved correctly

The HostStatus reported_at timestamp is now validated to match the DB
schema and populated if it's missing. HostStatus subclasses should
validate correctly without needing to call #refresh.
...

Fixes #12325 - Add to_utf8 method and ensure avatar_path returns in utf-8