Enable Qos in gate

Change-Id: Ia08c12c9c82000e4edd9025714b2655c8874c5ca
diff --git a/octavia_tempest_plugin/config.py b/octavia_tempest_plugin/config.py
index 36cb5ba..54eeabf 100644
--- a/octavia_tempest_plugin/config.py
+++ b/octavia_tempest_plugin/config.py
@@ -83,4 +83,8 @@
     cfg.StrOpt('member_role',
                default='load-balancer_member',
                help="Role to add to users created for octavia tests."),
+    cfg.StrOpt('vip_qos_policy_id',
+               default=None,
+               help='Existing QoS Policy ID in neutron to use for'
+                    'loadbalancer.')
 ]