Rollup all old configuration file templates, remove any related
to Quantum which was renamed in the Havana release.
Drop references in code to Quantum, refactor unit tests to baseline
on Icehouse rather than anything older.
Drop relation and associated references to nova-volume service;
deprecated in Folsom and removed in Havana.
Drop ml2 migration - this was required when migrating to Icehouse
from older releases.
Change-Id: I6f5d641ffef2599d0dfc8e16a2dce3cc7be88bd4