Update to ONOS 2.5.5 and minor release fixes

Change-Id: I4ee5f5273220a79e7f3e15344faa2e863c3d161f
diff --git a/VERSION b/VERSION
index c8e38b6..dedcc7d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.9.0
+2.9.1