'Finds the volume group name given its id
:param array: the array serial number
:param group_id: the group id
:returns: group_name: Name of the group'

def _find_volume_group_name_from_id(self, array, group_id):

    group_name = None
    sg_list = self.rest.get_storage_group_list(array)
    for sg in sg_list:
        if (group_id in sg):
            group_name = sg
            return group_name
    return group_name
