This patch creates an Amphora v2 provider driver as well as a
V2 controller worker.
This is in preparation for having the amphora driver use the new
provider driver data models and rely less on native Octavia database
access.
It is also a prepartion step for enabling TaskFlow JobBoard as
this work will move to storing dictionaries in the flows instead
of database models.
Change-Id: Ia65539a8c39560e2276750d8e79a637be4c0f265
Story: 2005072
Task: 30806
0ab16921ae