Revert "Setup resources with network for scenario tests"

This reverts commit 7903cd04001aa0276ed1711150afbdf7905871f9.

Reason for revert: Redundant patch

Change-Id: I66971413cc8cb2edad11c3dceb4cd6c4f7fb495b
diff --git a/barbican_tempest_plugin/tests/scenario/manager.py b/barbican_tempest_plugin/tests/scenario/manager.py
index 7cbfbf6..8be324a 100644
--- a/barbican_tempest_plugin/tests/scenario/manager.py
+++ b/barbican_tempest_plugin/tests/scenario/manager.py
@@ -40,11 +40,6 @@
     credentials = ['primary']
 
     @classmethod
-    def setup_credentials(cls):
-        cls.set_network_resources(network=True, subnet=True, router=True)
-        super().setup_credentials()
-
-    @classmethod
     def setup_clients(cls):
         super(ScenarioTest, cls).setup_clients()
         # Clients (in alphabetical order)