This patch simply renames quota modules introducing two
new packages:
1) neutron.quota
2) neutron.db.quota
This paves the way for adding more quota related modules.
Unit tests paths are changed accordingly, as well as references
to moved modules.
This patch hovewer preserves the ability of importing
neutron.db.quota_db in order to avoid breaking repositories which
use neutron as a requirement.
Change-Id: I946e87f1b2ebb3e80d64aecfe58aeff9f81896f3
Related-blueprint: better-quotas
1663f5c197