manager runs on Mac, and other openpilot for PC fixes (#1037)

* use the openpilot/persist directory on PC

* manager runs on mac

* sim runs w/o carla

* fix params location in test

* that rmtree can fail and it's okay

* refactor params clear functionality

* set PARAMS_PATH

old-commit-hash: c42e2ecc50

common/android.py

@@ -92,6 +92,8 @@ def parse_service_call_bytes(ret):
 
 def get_network_type(NetworkType):
   wifi_check = parse_service_call_string(service_call(["connectivity", "2"]))
+  if wifi_check is None:
+    return NetworkType.none
   if 'WIFI' in wifi_check:
     return NetworkType.wifi
   else: