client retrieval of freezer api endpoint
client retrieval of freezer api endpoint

The api client queries keystone to obtain the freezer api endpoint,
provided that the freezer api service and endpoint have been registered in
keystone.

An optional parameter to specify the api endpoint is supported

Change-Id: I6626a60d1fd5d18a59376165e94c789832865ae0
Implements: blueprint freezer-apiclient-endpoint

openstack/freezer-api,szaher/freezer-api,szaher/freezer-api,openstack/freezer-api,openstack/freezer-api,szaher/freezer-api,szaher/freezer-api,openstack/freezer-api