Make kubelet_fail_on_swap overridable

- Set kubelet_fail_on_swap param defults to False to prevent
failures with 1.8.x k8s version on tcp-qa templates

Change-Id: If20e42828ddf4b5382ca01eb031527059d244c97
diff --git a/tcp_tests/settings_oslo.py b/tcp_tests/settings_oslo.py
index d42b444..0796540 100644
--- a/tcp_tests/settings_oslo.py
+++ b/tcp_tests/settings_oslo.py
@@ -288,6 +288,8 @@
     ct.Cfg('kubernetes_externaldns_provider', ct.String(),
            help="", default='coredns'),
     ct.Cfg('kubernetes_coredns_enabled', ct.Boolean(),
+           help="", default=False),
+    ct.Cfg('kubelet_fail_on_swap', ct.Boolean(),
            help="", default=False)
 ]