Create only necessary networks resources for scenario tests

This patch leverages the set_network_resources method in
order to limit the network resources used.

Change-Id: Ia7defc783b5f55504e6c6923069f989a389a639f
diff --git a/tempest/scenario/test_dashboard_basic_ops.py b/tempest/scenario/test_dashboard_basic_ops.py
index 1081a3e..9e08bb6 100644
--- a/tempest/scenario/test_dashboard_basic_ops.py
+++ b/tempest/scenario/test_dashboard_basic_ops.py
@@ -34,6 +34,7 @@
 
     @classmethod
     def setUpClass(cls):
+        cls.set_network_resources()
         super(TestDashboardBasicOps, cls).setUpClass()
 
         if not cls.config.service_available.horizon:
diff --git a/tempest/scenario/test_large_ops.py b/tempest/scenario/test_large_ops.py
index 7f8d3e4..30468fa 100644
--- a/tempest/scenario/test_large_ops.py
+++ b/tempest/scenario/test_large_ops.py
@@ -36,6 +36,11 @@
 
     """
 
+    @classmethod
+    def setUpClass(cls):
+        cls.set_network_resources()
+        super(TestLargeOpsScenario, cls).setUpClass()
+
     def _wait_for_server_status(self, status):
         for server in self.servers:
             self.status_timeout(
diff --git a/tempest/scenario/test_server_advanced_ops.py b/tempest/scenario/test_server_advanced_ops.py
index 112c8a2..2c9446f 100644
--- a/tempest/scenario/test_server_advanced_ops.py
+++ b/tempest/scenario/test_server_advanced_ops.py
@@ -33,6 +33,7 @@
 
     @classmethod
     def setUpClass(cls):
+        cls.set_network_resources()
         super(TestServerAdvancedOps, cls).setUpClass()
 
         if not cls.config.compute_feature_enabled.resize:
diff --git a/tempest/scenario/test_swift_basic_ops.py b/tempest/scenario/test_swift_basic_ops.py
index 6763503..4ef2aca 100644
--- a/tempest/scenario/test_swift_basic_ops.py
+++ b/tempest/scenario/test_swift_basic_ops.py
@@ -39,6 +39,7 @@
 
     @classmethod
     def setUpClass(cls):
+        cls.set_network_resources()
         super(TestSwiftBasicOps, cls).setUpClass()
         if not cls.config.service_available.swift:
             skip_msg = ("%s skipped as swift is not available" %