Bug:#1359633 1) Stale cleaner support for Namespaces 2)Removing the references of Agent::Getinstance from NamespaceMananager classes 3) Extending the Namespace Name to have Loadbalancer poolid

Change-Id: If483d59e3de0cd2a1c0f75a81ed25335e18858c6
Merge "Bug:#1359633 1) Stale cleaner support for Namespaces 2)Removing the references of Agent::Getinstance from NamespaceMananager classes 3) Extending the Namespace Name to have Loadbalancer poolid" into R1.10