Fix resource_setup order in scenarios

As resource_setup() document says, we should check skip condition before
resource_setup. However some functions in scenarios setup resources
before skip checks. We should avoid to setup unnecessary resources as
possible. This commit fixes the order.

Change-Id: Id0529fc80f2b80f028fd078140fe5fd7459e9309
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 383a28d..7f591ba 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -475,9 +475,9 @@
 
     @classmethod
     def resource_setup(cls):
+        cls.check_preconditions()
         super(NetworkScenarioTest, cls).resource_setup()
         cls.tenant_id = cls.manager.identity_client.tenant_id
-        cls.check_preconditions()
 
     def _create_network(self, client=None, tenant_id=None,
                         namestart='network-smoke-'):
@@ -1016,12 +1016,11 @@
 class BaremetalScenarioTest(ScenarioTest):
     @classmethod
     def resource_setup(cls):
-        super(BaremetalScenarioTest, cls).resource_setup()
-
         if (not CONF.service_available.ironic or
            not CONF.baremetal.driver_enabled):
             msg = 'Ironic not available or Ironic compute driver not enabled'
             raise cls.skipException(msg)
+        super(BaremetalScenarioTest, cls).resource_setup()
 
         # use an admin client manager for baremetal client
         manager = clients.Manager(
@@ -1195,9 +1194,9 @@
 
     @classmethod
     def resource_setup(cls):
-        super(OrchestrationScenarioTest, cls).resource_setup()
         if not CONF.service_available.heat:
             raise cls.skipException("Heat support is required")
+        super(OrchestrationScenarioTest, cls).resource_setup()
 
     @classmethod
     def credentials(cls):
@@ -1240,12 +1239,12 @@
 
     @classmethod
     def resource_setup(cls):
-        cls.set_network_resources()
-        super(SwiftScenarioTest, cls).resource_setup()
         if not CONF.service_available.swift:
             skip_msg = ("%s skipped as swift is not available" %
                         cls.__name__)
             raise cls.skipException(skip_msg)
+        cls.set_network_resources()
+        super(SwiftScenarioTest, cls).resource_setup()
         # Clients for Swift
         cls.account_client = cls.manager.account_client
         cls.container_client = cls.manager.container_client
diff --git a/tempest/scenario/test_dashboard_basic_ops.py b/tempest/scenario/test_dashboard_basic_ops.py
index f218fb2..875a1d9 100644
--- a/tempest/scenario/test_dashboard_basic_ops.py
+++ b/tempest/scenario/test_dashboard_basic_ops.py
@@ -35,11 +35,10 @@
 
     @classmethod
     def resource_setup(cls):
-        cls.set_network_resources()
-        super(TestDashboardBasicOps, cls).resource_setup()
-
         if not CONF.service_available.horizon:
             raise cls.skipException("Horizon support is required")
+        cls.set_network_resources()
+        super(TestDashboardBasicOps, cls).resource_setup()
 
     def check_login_page(self):
         response = urllib2.urlopen(CONF.dashboard.dashboard_url)
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index 5d75b64..ec7b0ed 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -89,13 +89,13 @@
 
     @classmethod
     def resource_setup(cls):
-        # Create no network resources for these tests.
-        cls.set_network_resources()
-        super(TestNetworkBasicOps, cls).resource_setup()
         for ext in ['router', 'security-group']:
             if not test.is_extension_enabled(ext, 'network'):
                 msg = "%s extension not enabled." % ext
                 raise cls.skipException(msg)
+        # Create no network resources for these tests.
+        cls.set_network_resources()
+        super(TestNetworkBasicOps, cls).resource_setup()
 
     def setUp(self):
         super(TestNetworkBasicOps, self).setUp()
diff --git a/tempest/scenario/test_server_advanced_ops.py b/tempest/scenario/test_server_advanced_ops.py
index c53e22b..d10fcce 100644
--- a/tempest/scenario/test_server_advanced_ops.py
+++ b/tempest/scenario/test_server_advanced_ops.py
@@ -36,12 +36,11 @@
 
     @classmethod
     def resource_setup(cls):
-        cls.set_network_resources()
-        super(TestServerAdvancedOps, cls).resource_setup()
-
         if CONF.compute.flavor_ref_alt == CONF.compute.flavor_ref:
             msg = "Skipping test - flavor_ref and flavor_ref_alt are identical"
             raise cls.skipException(msg)
+        cls.set_network_resources()
+        super(TestServerAdvancedOps, cls).resource_setup()
 
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize is not available.')
diff --git a/tempest/scenario/test_stamp_pattern.py b/tempest/scenario/test_stamp_pattern.py
index 8ea2814..9ec899b 100644
--- a/tempest/scenario/test_stamp_pattern.py
+++ b/tempest/scenario/test_stamp_pattern.py
@@ -52,10 +52,9 @@
 
     @classmethod
     def resource_setup(cls):
-        super(TestStampPattern, cls).resource_setup()
-
         if not CONF.volume_feature_enabled.snapshot:
             raise cls.skipException("Cinder volume snapshots are disabled")
+        super(TestStampPattern, cls).resource_setup()
 
     def _wait_for_volume_snapshot_status(self, volume_snapshot, status):
         self.snapshots_client.wait_for_snapshot_status(volume_snapshot['id'],
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index a20db5c..62876c4 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -37,10 +37,9 @@
     """
     @classmethod
     def resource_setup(cls):
-        super(TestVolumeBootPattern, cls).resource_setup()
-
         if not CONF.volume_feature_enabled.snapshot:
             raise cls.skipException("Cinder volume snapshots are disabled")
+        super(TestVolumeBootPattern, cls).resource_setup()
 
     def _create_volume_from_image(self):
         img_uuid = CONF.compute.image_ref