Fixes #12834 - Avoid select2 integration test deadlock

The test was testing that selecting a hostgroup (1), then clicking on
inherit environment, then selecting another hostgroup (2) should return the
original environment. That overrides hostgroup 2 environment.

Fixes #12793 - reverted field filtration to enabled fields only

Fixes #12794 - Defined logic when properties should be sent to server

If hostgroup is not set - always send the parameters.
On hostgroup change - remove inherited parameters from the request, so the values from the hostgroup will take place.
On save - send the values according to the state of the "inherit" button.

Fixes #12083 - Set nic domain only on full match of fqdn domain

If there are domains that have subdomains, setting a host name that
contains an existing domain name will sometimes choose the wrong
domain for the host. This patch makes the nic set the domain only...

Fixes #12891 - search_by_params and search_by_user for host return correct results

Fixes #7230, #12021 - Upgrade to Rails 4.1.5

This commits upgrades Rails to Rails 4.1.5. See a description of the
changes included here, and go to the pull request in GitHub to see more
detailed explanations:

• Update gems to a Rails 4 compatible version, including dependencies...

Refs #6007 - fixing safe_value for lookup key

Fixes #12828 - Hidden value checkbox enabled after override button is checked

Fixes #12827 - deconstantize resource only when needed

Fixes #12180 - lookup_value presence validation moved from lookup_key

Global parameters can have empty values so smart variables that are also global should be allowed to accept empty values too.
The validation on lookup_value to make sure it isn't empty is in the LookupKey class therefore affecting both VariableLookupKey and PuppetClassLookupKey....