Updated RpcRegistry to accept a list of route identifiers while
adding or removing routes.

Removed few redundant defensive null checks.

Change-Id: I24310d2a3871a4bff2afa5a06b3657f4d2709794
Signed-off-by: Abhishek Kumar <abhishk2@cisco.com>
Merge "Updated RpcRegistry to accept a list of route identifiers while adding or removing routes."