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/Makefile.in b/agent/Makefile.in
index 9ec04a6..b8000d3 100644
--- a/agent/Makefile.in
+++ b/agent/Makefile.in
@@ -28,12 +28,12 @@
 # ACCTON_BAL_<BAL_VER>-<DEV_VER>.patch - Accton/Edgecore's patch.
 BAL_MAJOR_VER = 3
 BAL_MINOR_VER = 4
-BAL_REV_A_VER = 7
-BAL_REV_B_VER = 5
+BAL_REV_A_VER = 9
+BAL_REV_B_VER = 6
 BAL_API_VER = $(BAL_MAJOR_VER).$(BAL_MINOR_VER).$(BAL_REV_A_VER).$(BAL_REV_B_VER)
 BAL_VER = $(BAL_MAJOR_VER).$(BAL_MINOR_VER).$(BAL_REV_A_VER).$(BAL_REV_B_VER)
 SDK_VER = 6.5.13
-DEV_VER ?= 202008030101
+DEV_VER ?= 202008310101
 #
 # Version of Open Network Linux (ONL).
 ONL_KERN_VER_MAJOR = 4.14