Add join_consumer_pool() to RPC connections
Add join_consumer_pool() to RPC connections

blueprint move-listener-framework-oslo
bug 1047015
bug 1111632

Ceilometer and Quantum use private methods of the RPC connection
object to configure themselves to listen to a queue shared among a
group of workers. This change adds a public method to the RPC
connection to support this use case, without resorting to using
private API calls.

Change-Id: I3a89f1dfdcf8accca70cf305f7a31315bea093d8
Signed-off-by: Doug Hellmann <8c845c26a3868dadec615703cd974244eb2ac6d1@dreamhost.com>

JioCloud/oslo.db,magic0704/oslo.db,akash1808/oslo.db,varunarya10/oslo.db,malor/oslo.db,vikt0rs/oslo.db,openstack/oslo.db,openstack/oslo.db