Lbaas changes. Bug id :  1359633. Creating operational db as loadbalancer-pool and creating a listener for config db. Corresponding test changes

Change-Id: Ia522167090f5ef55ae2b20203d29896d96eaba9a
Merge "Lbaas changes. Bug id :  1359633. Creating operational db as loadbalancer-pool and creating a listener for config db. Corresponding test changes"