SEBA-749 Implemented on demand api code for test action in pyvoltha

Change-Id: Ib7a50bcfdb2f2f28b50406f92539415c92fcd0f1
diff --git a/requirements.txt b/requirements.txt
index f7af3a3..016156c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,4 @@
 structlog==19.2.0
 transitions==0.6.4
 txaioetcd==0.3.0
-voltha-protos==3.2.3
+voltha-protos==3.2.8