Revert "[TF] Skip check external connectivity (PRODX-5188)"

This reverts commit 433ad73dda82c7c2a476833f4ed32e2458df5b17.

Reason for revert: <INSERT REASONING HERE>

Change-Id: I045247367e93ac42121b5fdf55a5fc2f2cca6b4c
diff --git a/neutron_tempest_plugin/scenario/test_security_groups.py b/neutron_tempest_plugin/scenario/test_security_groups.py
index b18eca8..dc14857 100644
--- a/neutron_tempest_plugin/scenario/test_security_groups.py
+++ b/neutron_tempest_plugin/scenario/test_security_groups.py
@@ -175,10 +175,8 @@
                 ext_net_ip = subnet['gateway_ip']
                 break
         self.assertTrue(ext_net_ip)
-        # (PRODX-5188) Skip check connectivity with gateway:
-        if not CONF.service_available.contrail:
-            self.check_remote_connectivity(server_ssh_clients[0], ext_net_ip,
-                                           servers=servers)
+        self.check_remote_connectivity(server_ssh_clients[0], ext_net_ip,
+                                       servers=servers)
 
     @decorators.idempotent_id('3d73ec1a-2ec6-45a9-b0f8-04a283d9d864')
     def test_protocol_number_rule(self):