Update voltha-stack with latest versions

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: I7aba956aab4eb765778987e43ccbe4e40e38083b
diff --git a/VERSION b/VERSION
index 269aa9c..ff313b8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.8.3
+3.8.4