Remove unused variable

TrivialFix

Change-Id: I2dc65d75ed1b00f8833a7bf44541476c7f10a609
diff --git a/tempest/scenario/test_network_v6.py b/tempest/scenario/test_network_v6.py
index f33784e..3eae522 100644
--- a/tempest/scenario/test_network_v6.py
+++ b/tempest/scenario/test_network_v6.py
@@ -110,7 +110,7 @@
     @staticmethod
     def define_server_ips(srv):
         ips = {'4': None, '6': []}
-        for net_name, nics in srv['addresses'].items():
+        for nics in srv['addresses'].values():
             for nic in nics:
                 if nic['version'] == 6:
                     ips['6'].append(nic['addr'])