VOL-3710 Avoid concurrent access to the flows map in olt.go

Change-Id: I0f7fc493efeb8f2d28c1ee276d24cda348126f09
diff --git a/VERSION b/VERSION
index 347f583..f9f73cc 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.4.1
+1.4.2-dev