Extend the RPC API to include functions to retrieve LBaaS object state.
Extend the RPC API to include functions to retrieve LBaaS object state.

Issues:
Add functions to support pruning the orphaned objects from the BIG-IP

Analysis:
Given a list of LBaaS objects, loadbalancers, listeners, pools, these
functions will return the status of each.

Test:
Manual

Add cluster wide agents dictionary

F5Networks/f5-openstack-lbaasv2-driver,jlongstaf/f5-openstack-lbaasv2-driver,richbrowne/f5-openstack-lbaasv2-driver,jputrino/f5-openstack-lbaasv2-driver,richbrowne/f5-openstack-lbaasv2-driver,jlongstaf/f5-openstack-lbaasv2-driver,jputrino/f5-openstack-lbaasv2-driver,F5Networks/f5-openstack-lbaasv2-driver