[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/Makefile b/Makefile
index 9598444..fb7f456 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@
 
 ## Variables
 OPENOLTDEVICE     ?= asfvolt16
-OPENOLT_PROTO_VER ?= v3.3.4
+OPENOLT_PROTO_VER ?= v3.3.5
 GTEST_VER         ?= release-1.8.0
 CMOCK_VER         ?= 0207b30
 GMOCK_GLOBAL_VER  ?= 1.0.2