Add list-networks test for os-networks API

Adds a test to list networks for a non-admin tenant
using the compute os-networks API.

For Flat* network managers in nova, a tenant is not
assigned to a network so this tests that when listing
networks with a non-admin tenant, we get something back
since the underlying code in nova should pass 'allow_none'
to the DB API when listing the networks for Flat and
FlatDHCP network managers.

Change-Id: I5c50607279a8a385ebe96bf498e3e95079d6dec1
Related-Bug: #1327406
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index 6507ce1..2f53a0b 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -72,6 +72,8 @@
             cls.quotas_client = cls.os.quotas_client
             # NOTE(mriedem): os-quota-class-sets is v2 API only
             cls.quota_classes_client = cls.os.quota_classes_client
+            # NOTE(mriedem): os-networks is v2 API only
+            cls.networks_client = cls.os.networks_client
             cls.limits_client = cls.os.limits_client
             cls.volumes_extensions_client = cls.os.volumes_extensions_client
             cls.volumes_client = cls.os.volumes_client
diff --git a/tempest/api/compute/test_networks.py b/tempest/api/compute/test_networks.py
new file mode 100644
index 0000000..86779b3
--- /dev/null
+++ b/tempest/api/compute/test_networks.py
@@ -0,0 +1,33 @@
+# Copyright 2014 IBM Corp.
+#
+#    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.api.compute import base
+from tempest import config
+from tempest import test
+
+CONF = config.CONF
+
+
+class NetworksTestJSON(base.BaseV2ComputeTest):
+    @classmethod
+    def resource_setup(cls):
+        if CONF.service_available.neutron:
+            raise cls.skipException('nova-network is not available.')
+        super(NetworksTestJSON, cls).resource_setup()
+        cls.client = cls.os.networks_client
+
+    @test.attr(type='gate')
+    def test_list_networks(self):
+        _, networks = self.client.list_networks()
+        self.assertNotEmpty(networks, "No networks found.")