If controller joins the cluster late, and the owner of the device

is already decided, EntityOwnershipService won't notify new candidate that register
for ownership. Adding a proactive check on the ownership state of the device,
so if it's already owned, adding the connection instances in the connection cache.

Change-Id: I7e87b55599f0ebd408814d72789c86f231b7907c
Signed-off-by: Anil Vishnoi <vishnoianil@gmail.com>