def __virtual__():
    return 'keystone' if 'keystone.auth' in __salt__ else False
PUT handler on Proxy
dataset/ETHPy150Open saltstack/salt/salt/states/keystone.py/__virtual__--crossover with--dataset/ETHPy150Open openstack/storlets/Engine/swift/storlet_middleware/storlet_handler.py/StorletProxyHandler.PUT