Update gorouter submodule and job

The gorouter start script no longer writes out the PID file. This is done by
the gorouter itself to prevent monit from thinking it is started when it is
not.

$ git shortlog ca032b7d..34cd7912
Pieter Noordhuis and Tim Labeeuw (4):
      Add pidfile field to configuration struct
      Add PID file helper function
      Write PID file when the router starts serving requests
      Start listening after giving the registry time to fill up

Change-Id: I994dee57f76bde28b09fe8f698d4d901a7772fdf