- adds simple chance scheduling on create pool operation
- adds PoolsLoadbalancerAgentBinding db table
- adds lbaas_agentscheduler extension to list pools hosted by a particular agent
and to get an agent hosting a particular pool
- adds agent notifiers mapping to AgentSchedulerDbMixin to make it easier
for services to add their agent notifiers to the core plugin
Implements blueprint lbaas-agent-scheduler
Change-Id: Id98649fd5c7873dcd5be1a2b117b8bed25f06cc2
da65fe6951