Add error log of addConnetionService in RemoteConnectionManager.

There's UnsupportedOperationException in RemoteConnectionManager which
means sometimes we can't find corresponding ConnectionService and we
can't find the root cause of this. Try to print more log if there's
RemoteException when we add ConnectionService.

Bug: 175466894
Test: Manual test
Change-Id: Ia34cf8777c17c3eb45476018125d9b92db391e28