Add missed rsyslog formula to k8s-aio models

Change-Id: I9b706996e618da4ed9f81a73acaaf810566516cd
diff --git a/classes/cluster/k8s-aio-contrail/.env b/classes/cluster/k8s-aio-contrail/.env
index 407e2d1..4687819 100644
--- a/classes/cluster/k8s-aio-contrail/.env
+++ b/classes/cluster/k8s-aio-contrail/.env
@@ -1 +1 @@
-EXTRA_FORMULAS="ntp"
+EXTRA_FORMULAS="ntp rsyslog"