Revert "Setup resources with network for scenario tests"

This reverts commit 3cdd8293e7dee72415a61fce8a7926fb70d588d1.

Reason for revert: Redundant patch

Change-Id: I69f2cb3c3f901bcd6ab363b60d62227b5f384f3d
diff --git a/barbican_tempest_plugin/tests/scenario/manager.py b/barbican_tempest_plugin/tests/scenario/manager.py
index 7cdc5a8..f91e27b 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)