Catch NoResultFound in _get_policy_profile_by_name

Add try-except in _get_policy_profile_by_name to raise
proper PolicyProfileNameNotFound if profile not found in
database.

Also unittest is added.

Closes-bug: #1393399

Change-Id: I3ab50a6870ff77a95e0977c75255e9cbd7286fbb
Eliminate unnecessary indirection in L3 agent

These indirections serve no useful purpose.  Normally, I wouldn't
bother to change them but these make other refactoring efforts a bit
more of a pain.

Change-Id: Ia73c93eb2eaa81d5772b3e0178fdf18f0c275b4c
Fix context.elevated

The current version of elevated method sets for the original context
the admin role too. This change fix this.

Added unittest.

Closes-bug: #1386932

Change-Id: Ife881112efa151e53bfa4b7af35643dcf2d1114f
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: I754cecc4efba2c9cd385de99901dce8c2188fce0
Merge "Imported Translations from Transifex"
Merge "Fix context.elevated"
Merge "Catch NoResultFound in _get_policy_profile_by_name"
Merge "Eliminate unnecessary indirection in L3 agent"