'Creates a consistency group.
:param context: the context
:param group: the group object to be created
:returns: dict -- modelUpdate = {\'status\': \'available\'}
:raises: VolumeBackendAPIException'

def create_consistencygroup(self, context, group):

    create_data = {'consistency-group-name': group['id']}
    self.client.req('consistency-groups', 'POST', data=create_data, ver='v2')
    return {'status': fields.ConsistencyGroupStatus.AVAILABLE}
