Add pool listing to python designate client

Pool listing is required in downstream apps
which use python designate client like searchlight
to retrive list of pool.

Change-Id: I44d3a53d2b490fe9a4cca3858734ca70bb5e0f88
Closes-Bug: #1563497

designateclient/v2/client.py

@@ -19,6 +19,7 @@ from designateclient import exceptions
 from designateclient.v2.blacklists import BlacklistController
 from designateclient.v2.limits import LimitController
 from designateclient.v2.nameservers import NameServerController
+from designateclient.v2.pools import PoolController
 from designateclient.v2.recordsets import RecordSetController
 from designateclient.v2.reverse import FloatingIPController
 from designateclient.v2.service_statuses import ServiceStatusesController
@@ -131,3 +132,4 @@ class Client(object):
         self.zone_transfers = ZoneTransfersController(self)
         self.zone_exports = ZoneExportsController(self)
         self.zone_imports = ZoneImportsController(self)
+        self.pools = PoolController(self)

designateclient/v2/pools.py

@@ -0,0 +1,22 @@
+# Copyright (c) 2016 Hewlett-Packard Enterprise Development Company, L.P.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from designateclient.v2.base import V2Controller
+
+
+class PoolController(V2Controller):
+    def list(self):
+        url = '/pools'
+        return self._get(url, response_key='pools')