def service_update(self, ctxt, host_name, binary, params_to_update):
        cctxt = self.client.prepare(version='1.7')
        return cctxt.call(ctxt, 'service_update',
                          host_name=host_name,
                          binary=binary,
                          params_to_update=params_to_update)
Used to enable/disable a service. For compute services, setting to
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/cells/rpcapi.py/CellsAPI.service_update