[BugFix] Updated the apiNumber in the pytests (#449)

python/tests/test_bc.py

       "brainNames": ["RealFakeBrain"],
       "externalBrainNames": ["RealFakeBrain"],
       "logPath":"RealFakePath",
-      "apiNumber":"API-2",
+      "apiNumber":"API-3",
       "brainParameters": [{
           "vectorObservationSize": 3,
           "numStackedVectorObservations": 2,
       "brainNames": ["RealFakeBrain"],
       "externalBrainNames": ["RealFakeBrain"],
       "logPath":"RealFakePath",
-      "apiNumber":"API-2",
+      "apiNumber":"API-3",
       "brainParameters": [{
           "vectorObservationSize": 3,
           "numStackedVectorObservations": 2,

python/tests/test_ppo.py

       "brainNames": ["RealFakeBrain"],
       "externalBrainNames": ["RealFakeBrain"],
       "logPath":"RealFakePath",
-      "apiNumber":"API-2",
+      "apiNumber":"API-3",
       "brainParameters": [{
           "vectorObservationSize": 3,
           "numStackedVectorObservations": 2,
       "brainNames": ["RealFakeBrain"],
       "externalBrainNames": ["RealFakeBrain"],
       "logPath":"RealFakePath",
-      "apiNumber":"API-2",
+      "apiNumber":"API-3",
       "brainParameters": [{
           "vectorObservationSize": 3,
           "numStackedVectorObservations": 2,

python/tests/test_unityagents.py

   "brainNames": ["RealFakeBrain"],
   "externalBrainNames": ["RealFakeBrain"],
   "logPath":"RealFakePath",
-  "apiNumber":"API-2",
+  "apiNumber":"API-3",
   "brainParameters": [{
       "vectorObservationSize": 3,
       "numStackedVectorObservations": 2,

python/tests/test_unitytrainers.py

   "brainNames": ["RealFakeBrain"],
   "externalBrainNames": ["RealFakeBrain"],
   "logPath":"RealFakePath",
-  "apiNumber":"API-2",
+  "apiNumber":"API-3",
   "brainParameters": [{
       "vectorObservationSize": 3,
       "numStackedVectorObservations" : 2,