ensure dispatcher service is configured before rpc

there is a rare race condition where when the mq contains
notifications, the rpc service is configured before dispatcher so
it may attempt to start sending messages to dispatcher before it
has been configured. this patch ensures the dispatcher
configuration is done before starting rpc service.

Change-Id: If4c3a225e0bd5ae6eefad072b844af1ef5786f3f
Merge "ensure dispatcher service is configured before rpc"