updated the tests of unityagents

python/test_unityagents.py

   "AcademyName": "RealFakeAcademy",
   "resetParameters": {},
   "brainNames": ["RealFakeBrain"],
+  "externalBrainNames": ["RealFakeBrain"],
   "brainParameters": [{
       "stateSize": 3,
       "actionSize": 2,
   "agents": [1,2],
   "states": [1,2,3,4,5,6],
   "rewards": [1,2],
-  "actions": null,
+  "actions": [1,2,3,4],
   "memories": [],
   "dones": [false, false]
 }'''.encode(),
   "agents": [1,2,3],
   "states": [1,2,3,4,5,6,7,8,9],
   "rewards": [1,2,3],
-  "actions": null,
+  "actions": [1,2,3,4,5,6],
   "memories": [],
   "dones": [false, false, false]
 }'''.encode(),
   "agents": [1,2,3],
   "states": [1,2,3,4,5,6,7,8,9],
   "rewards": [1,2,3],
-  "actions": null,
+  "actions": [1,2,3,4,5,6],
   "memories": [],
   "dones": [false, false, true]
 }'''.encode(),