Enable linux ipv4 forwarding for k8s.

Related story: PROD-23498

Change-Id: I9317223e84fcd5a1a6b52cfe21c0ff97a52716da
diff --git a/kubernetes/common/init.yml b/kubernetes/common/init.yml
index ded78c7..76c1e9a 100644
--- a/kubernetes/common/init.yml
+++ b/kubernetes/common/init.yml
@@ -116,6 +116,11 @@
     kubernetes_telegraf_agent_quiet: false
     kubernetes_telegraf_agent_omit_hostname: false
 
+  linux:
+    system:
+      kernel:
+        sysctl:
+          net.ipv4.ip_forward: 1
   docker:
     host:
       pkgs: