Allowing for empty deb version for ADTRAN OLT
Also avoiding logging if OLT does not provide usr/pwd

Change-Id: I1b895bb1350c8865129e76909db040606c9d3ce0
diff --git a/VERSION b/VERSION
index e70b452..6a6a3d8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.6.0
+2.6.1