When an Octavia member transaction to NSX fails, sometimes pool member
lists are out of sync which results with transaction failures.
The following leverages the fact that the Octavia driver nests the
whole list of members during every transaction within the pool, and
verifies that the pool members are synchronized with NSX
Change-Id: I18221dbc564db5b3ef967e64540eba6e0772afae
78f4d85a31