In the case that nova failed to delete an amphroa they will continue to send
health heartbeat messages the the health manager. This patch improves the
logging of these amphora.
It also optimizes the statistics update flow when event streaming is
disabled by removing two extra database calls.
This patch also removes the un-used BaseControllerTask class.
This patch also finally solidifies that there will be one LB per amphora.
Change-Id: Idf83b19216c680a4854c1239ed9c5bc5ce7364a7
1417f6f0f8