Configure ENABLED_QUOTA_GROUPS for Horizon

Configure local_settings.py according to 'nova_quota' parameter
from Fuel settings. We need to use 'scope.lookupvar' in template
here for compatibility reasons with future upstream sync:

https://review.openstack.org/132688

We're going to use custom local_settings template after upgrade,
to avoid unnecessary changes in 'horizon' community module.

Change-Id: I647430b1799b752a0e6c44b363830d78c5bb3d9a
Related-bug: #1332457
Merge "Configure ENABLED_QUOTA_GROUPS for Horizon"