Shorten org.opendaylight.controller.sal.core.api.Broker.RoutedRpcRegistration

We can safely import the class, shortening references to it.

Change-Id: I41d5ca29f1dd4daff726d3598c1bf14732318752
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Shorten org.opendaylight.controller.sal.core.api.Broker.RoutedRpcRegistration"