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/agent/test/Makefile b/agent/test/Makefile
index 5245f03..25c7ce0 100644
--- a/agent/test/Makefile
+++ b/agent/test/Makefile
@@ -41,7 +41,7 @@
 
 export CXX CXXFLAGS OPENOLT_PROTO_VER
 
-BAL_API_VER ?= bal-api-3.4.7.5
+BAL_API_VER ?= bal-api-3.4.9.6
 BAL_API_DIR=$(BAL_API_VER)
 BALLIBNAME=bcm_host_api_stubs
 BALLIBDIR=$(BAL_API_DIR)/stubs