[VOL-4589] Add interface speed field to openolt proto

Change-Id: I7676a7979a821dc85dc287ae7326737ae8063f6f
diff --git a/VERSION b/VERSION
index 91ff572..26d99a2 100755
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.2.0
+5.2.1