fix on the test script

Error was due to the absence of logpath in the dummy handshake message

python/test_unityagents.py

   "resetParameters": {},
   "brainNames": ["RealFakeBrain"],
   "externalBrainNames": ["RealFakeBrain"],
+  "logPath":"RealFakePath",
   "apiNumber":"API-2",
   "brainParameters": [{
       "stateSize": 3,