missing network configuration in telemetry tests

teardown throws error as it doesn't know about network resources.

Change-Id: I404c35b9caeaf2812bd62fe62560e5f92cc2e64f
Closes-Bug: #1359261
diff --git a/tempest/api/telemetry/base.py b/tempest/api/telemetry/base.py
index b5b2bb1..8c2f37b 100644
--- a/tempest/api/telemetry/base.py
+++ b/tempest/api/telemetry/base.py
@@ -29,6 +29,7 @@
     def setUpClass(cls):
         if not CONF.service_available.ceilometer:
             raise cls.skipException("Ceilometer support is required")
+        cls.set_network_resources()
         super(BaseTelemetryTest, cls).setUpClass()
         os = cls.get_client_manager()
         cls.telemetry_client = os.telemetry_client