Cinder tests for Volume hosts policy actions

Adds cinder RBAC test for listing volume hosts

Implements bp: initial-tests-volume
Co-Authored-By: Rick Bartra <rb560u@att.com>
Co-Authored-By: Anthony Bellino <ab2434@att.com>

Change-Id: I6f31cee7963e1fef91f9846503e42885d7e7ead7
diff --git a/patrole_tempest_plugin/tests/api/volume/rbac_base.py b/patrole_tempest_plugin/tests/api/volume/rbac_base.py
index 60ec77e..1cb128e 100644
--- a/patrole_tempest_plugin/tests/api/volume/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/volume/rbac_base.py
@@ -65,3 +65,9 @@
         cls.auth_provider = cls.os.auth_provider
         cls.admin_client = cls.os_adm.volumes_client
         cls.rbac_utils = rbac_utils()
+        version_checker = {
+            1: [cls.os.volume_hosts_client, cls.os.volume_types_client],
+            2: [cls.os.volume_hosts_v2_client, cls.os.volume_types_v2_client]
+        }
+        cls.volume_hosts_client, cls.volume_types_client = \
+            version_checker[cls._api_version]
diff --git a/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py b/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py
new file mode 100644
index 0000000..45720e6
--- /dev/null
+++ b/patrole_tempest_plugin/tests/api/volume/test_volume_hosts_rbac.py
@@ -0,0 +1,33 @@
+# Copyright 2017 AT&T Corporation.
+# All Rights Reserved.
+#
+#    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 tempest.lib import decorators
+
+from patrole_tempest_plugin import rbac_rule_validation
+from patrole_tempest_plugin.tests.api.volume import rbac_base
+
+
+class VolumeHostsAdminRbacTest(rbac_base.BaseVolumeAdminRbacTest):
+
+    def tearDown(self):
+        self.rbac_utils.switch_role(self, switchToRbacRole=False)
+        super(VolumeHostsAdminRbacTest, self).tearDown()
+
+    @rbac_rule_validation.action(service="cinder",
+                                 rule="volume_extension:hosts")
+    @decorators.idempotent_id('64e837f5-5452-4e26-b934-c721ea7a8644')
+    def test_list_hosts(self):
+        self.rbac_utils.switch_role(self, switchToRbacRole=True)
+        self.volume_hosts_client.list_hosts()