Fix string formatting in log statement

Use newer xos-core with fixed kafkaloghandler

Change-Id: I532910d4aad0dc5142f54451fd7769220fcb1340
diff --git a/VERSION b/VERSION
index ebf14b4..63a1a1c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.8
+2.1.9