Changed test logger behavior to avoid expected error logging

[FarmersWrap]

Solves https://github.com/socketio/socket.io-client-java/issues/756.
The logic of the program is not changed, but the logic for the logger during tests is modified. Since the JSONException is an expected behavior, we do not want to print this expected error into the console.

[dubeyaditya29]

this hides the error from the console should have been merged.

[darrachequesne]

Thanks!