Add cloudlog for is_on_wifi fail

selfdrive/loggerd/uploader.py

@@ -67,11 +67,13 @@ def clear_locks(root):
 def is_on_wifi():
   # ConnectivityManager.getActiveNetworkInfo()
   try:
+    # TODO: figure out why the android service call sometimes dies with SIGUSR2 (signal from MSGQ)
     result = android.parse_service_call_string(android.service_call(["connectivity", "2"]))
     if result is None:
       return True
     return 'WIFI' in result
   except (AttributeError, subprocess.CalledProcessError):
+    cloudlog.exception("is_on_wifi failed")
     return False
 
 def is_on_hotspot():