VOL-2153 move flow_utils.go from voltha-go to voltha-lib-go;
release 2.2.6

Based on voltha-go commit ec6e61b6239b955b6e7623ba3b604e8030154773

Change-Id: Id52f3eb1cb4bcade3f0e42da0129b643fdc5b0f9
diff --git a/VERSION b/VERSION
index f963933..bda8fbe 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.6-dev
+2.2.6