Add k8s metallb test and sampleservice class

Change-Id: Ibfae133cc0841f802e93b290c87d411ef69d1a25
Related-PROD: PROD-21474
diff --git a/tcp_tests/settings_oslo.py b/tcp_tests/settings_oslo.py
index 45b871d..541ca34 100644
--- a/tcp_tests/settings_oslo.py
+++ b/tcp_tests/settings_oslo.py
@@ -344,6 +344,8 @@
            help="", default='coredns'),
     ct.Cfg('kubernetes_coredns_enabled', ct.Boolean(),
            help="", default=False),
+    ct.Cfg('kubernetes_metallb_enabled', ct.Boolean(),
+           help="", default=False),
     ct.Cfg('kubelet_fail_on_swap', ct.Boolean(),
            help="", default=False)
 ]