VOL-4268: Migration to BAL3.4.9.9 for voltha master and 2.8 branch

Change-Id: I66c77149524f2592fb018a3bc00dc9c8a8f94153
diff --git a/agent/test/Makefile b/agent/test/Makefile
index a6e983d..24a4382 100644
--- a/agent/test/Makefile
+++ b/agent/test/Makefile
@@ -41,7 +41,7 @@
 
 export CXX CXXFLAGS OPENOLT_PROTO_VER
 
-BAL_API_VER ?= bal-api-3.4.9.6
+BAL_API_VER ?= bal-api-3.4.9.9
 BAL_API_DIR=$(BAL_API_VER)
 BALLIBNAME=bcm_host_api_stubs
 BALLIBDIR=$(BAL_API_DIR)/stubs