Get rid of useless tenant_id attribiute

The corresponding tenant_id will be retrieved
automatically for all neutron scenario tests
helper functions. There is no need to cache
it before.

Change-Id: I28f3f1084b91c809335494eb16219b3d9261b8bf
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index dd1adc7..6ce4cfe 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -676,11 +676,6 @@
         if not CONF.service_available.neutron:
             raise cls.skipException('Neutron not available')
 
-    @classmethod
-    def resource_setup(cls):
-        super(NetworkScenarioTest, cls).resource_setup()
-        cls.tenant_id = cls.manager.identity_client.tenant_id
-
     def _create_network(self, networks_client=None,
                         routers_client=None, tenant_id=None,
                         namestart='network-smoke-',
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index 125d61a..e177cb0 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -105,8 +105,7 @@
 
     def _setup_network_and_servers(self, **kwargs):
         boot_with_port = kwargs.pop('boot_with_port', False)
-        self.security_group = \
-            self._create_security_group(tenant_id=self.tenant_id)
+        self.security_group = self._create_security_group()
         self.network, self.subnet, self.router = self.create_networks(**kwargs)
         self.check_networks()
 
@@ -229,7 +228,7 @@
             floating_ip, server)
 
     def _create_new_network(self, create_gateway=False):
-        self.new_net = self._create_network(tenant_id=self.tenant_id)
+        self.new_net = self._create_network()
         if create_gateway:
             self.new_subnet = self._create_subnet(
                 network=self.new_net)
diff --git a/tempest/scenario/test_network_v6.py b/tempest/scenario/test_network_v6.py
index 496f07e..6700236 100644
--- a/tempest/scenario/test_network_v6.py
+++ b/tempest/scenario/test_network_v6.py
@@ -63,7 +63,7 @@
     def setUp(self):
         super(TestGettingAddress, self).setUp()
         self.keypair = self.create_keypair()
-        self.sec_grp = self._create_security_group(tenant_id=self.tenant_id)
+        self.sec_grp = self._create_security_group()
 
     def prepare_network(self, address6_mode, n_subnets6=1, dualnet=False):
         """Prepare network
@@ -74,15 +74,15 @@
         if dualnet - create IPv6 subnets on a different network
         :return: list of created networks
         """
-        self.network = self._create_network(tenant_id=self.tenant_id)
+        self.network = self._create_network()
         if dualnet:
-            self.network_v6 = self._create_network(tenant_id=self.tenant_id)
+            self.network_v6 = self._create_network()
 
         sub4 = self._create_subnet(network=self.network,
                                    namestart='sub4',
                                    ip_version=4)
 
-        router = self._get_router(tenant_id=self.tenant_id)
+        router = self._get_router()
         self.routers_client.add_router_interface(router['id'],
                                                  subnet_id=sub4['id'])