VOL-2861 replace uint64 kafka interadapter timestamps with timestamp proto

Change-Id: Ib7de52ce7a663b4817e383f03f34e4398d6c980d
diff --git a/VERSION b/VERSION
index 3ad0595..9cec716 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.1.5
+3.1.6