Filter out external networks in NetworksSearchCriteriaTest

Otherwise those networks that may even belong to another tenant still
show up in the results that we then compare iterated networks to.

Change-Id: I24b117401a1886dce0b78900b522ac9bace533bf
Closes-Bug: #1614964
diff --git a/neutron/tests/tempest/api/test_networks.py b/neutron/tests/tempest/api/test_networks.py
index 16fe81b..d3967ea 100644
--- a/neutron/tests/tempest/api/test_networks.py
+++ b/neutron/tests/tempest/api/test_networks.py
@@ -95,7 +95,7 @@
 
     resource = 'network'
 
-    list_kwargs = {'shared': False}
+    list_kwargs = {'shared': False, 'router:external': False}
 
     @classmethod
     def resource_setup(cls):