Add message check for having a vote requested

DecisionSystem/CentralisedDecision/ballotvoter.py

@@ -27,6 +27,8 @@ class BallotVoter:
         messageDict = umsgpack.unpackb(message)
         if "type" in messageDict.keys:
             # Ok message.
+            if messageDict["type"] == "reqVote":
+                submit_vote()
         else:
             # Bad message.