veyron/runtimes/google/ipc: Preventing addName and removeName cuasing panics (nil s.names map) if called before Serve() or ServerDispatcher(). Return error instead.
veyron/runtimes/google/ipc: Preventing addName and removeName cuasing panics
(nil s.names map) if called before Serve() or ServerDispatcher().
Return error instead.

Change-Id: I9eb68f62a2eedf90afa2e4c99d2c229c7febd52d

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref