[VOL-2055] Use Tech Profile ID to differentiate downstream traffic scheduler

- CreateQueue / RemoveQueue / CreateSched / RemoveSched / FlowAdd updated to include
  tech_profile_id to select downstream scheduler.
- A DS scheduler is now identified by the tuple (pon, onu, uni, dir, tech_profile_id)
- voltha_protos v3.3.5 is now referred.
- Unit tests updated.
- VERSION updated.

Change-Id: I399bbb03aa33b61a02da10af0a40d354d44bd5cf
diff --git a/agent/test/Makefile b/agent/test/Makefile
index a27f399..a32c160 100644
--- a/agent/test/Makefile
+++ b/agent/test/Makefile
@@ -21,7 +21,7 @@
 TOP_DIR=`pwd`
 OPENOLTDEVICE ?= asfvolt16
 
-OPENOLT_PROTO_VER ?= v3.3.4
+OPENOLT_PROTO_VER ?= v3.3.5
 
 GTEST_VER ?= release-1.8.0
 gtest-target = /usr/local/lib/libgtest.a