Add parameter to override kubernetes_dns enablement

Set it to true before release

Change-Id: Ic021a85a6cb3ce3d584e4b06476e251189457f12
diff --git a/tcp_tests/settings_oslo.py b/tcp_tests/settings_oslo.py
index 7613a2c..037dbd8 100644
--- a/tcp_tests/settings_oslo.py
+++ b/tcp_tests/settings_oslo.py
@@ -336,6 +336,8 @@
            help="", default=False),
     ct.Cfg('kubernetes_virtlet_image', ct.String(),
            help="", default='mirantis/virtlet:v1.1.0'),
+    ct.Cfg('kubernetes_dns', ct.Boolean(),
+           help="", default=True),
     ct.Cfg('kubernetes_externaldns_enabled', ct.Boolean(),
            help="", default=False),
     ct.Cfg('kubernetes_externaldns_image', ct.String(),