Bump version to 3.2.0
Update README.md for voltha-2.6 release
Update BUILDING.md file for using BAL3.4.9.6 package
Update debian package files to build for BAL 3.4.9.6
Fix issue in dev_mgmt_daemon service script

Change-Id: I0853bef9f30f67b8db0868f6dbb92c8248ce0130
diff --git a/VERSION b/VERSION
index 8d70082..944880f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.1.1-dev
+3.2.0