Remove unused upstart commands left in GCE driver.
Remove unused upstart commands left in GCE driver.

Signed-off-by: Tao Wang <7e7be65ebb8f801a58c89ee3c1a6a687290e952e@gmail.com>

SvenDowideit/machine,docker/machine,docker/machine,SvenDowideit/machine,dgageot/machine,londoncalling/machine,ibuildthecloud/machine,dgageot/machine,exoscale/docker-machine,voutilad/machine,voutilad/machine,flavio/machine,Herbis/machine,Herbis/machine,dweomer/docker-machine,londoncalling/machine,dweomer/docker-machine,larsla/machine,larsla/machine,exoscale/docker-machine,flavio/machine,ibuildthecloud/machine