'Failover volumes to a secondary host/ backend.
:param context: the context
:param volumes: the list of volumes to be failed over
:param secondary_id: the backend to be failed over to, is \'default\'
if fail back
:param groups: replication groups
:returns: secondary_id, volume_update_list, group_update_list'

def failover_host(self, context, volumes, secondary_id=None, groups=None):

    return self.common.failover_host(volumes, secondary_id, groups)
