update protobuf go_package option
update protobuf go_package option

Signed-off-by: Peter Edge <479a4710fed3c4e108328288f4ad3c9436981212@gmail.com>

libopenstorage/openstorage,ModelRocket/openstorage,libopenstorage/openstorage,pault84/openstorage,pault84/openstorage,pault84/openstorage,libopenstorage/openstorage,ModelRocket/openstorage