VOL-1460 Migrated to use voltha-protos

Also removed uses of third_party, which didn't seem to be used, and is not currently provided by voltha-protos

Change-Id: I360b9a67adc981912bb96bdcdd4f41354e0b6772
diff --git a/requirements.txt b/requirements.txt
index 205d524..8b1a953 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,4 +50,5 @@
 Twisted==18.7.0
 txaioetcd==0.3.0
 urllib3==1.22
+voltha-protos==0.1.0
 afkak==3.0.0.dev20181106