This is the base patch that updates octavia to use the new octavia-lib.
It is backwards compatible by using debtcollector moves.
It adds a new controller process called the "driver-agent".
This patch also adds unit test coverage for a few additional modules.
Depends-On: https://review.openstack.org/#/c/641180/
Change-Id: I438e1548ec0fb6111d1ab85b05015007d9d0a006