Set allow_reuse_address for GetAuthCodeServer helper class

[KennethWilke]

Currently the GetAuthCodeServer socket lingers, this change helps prevent occurences of socket.error: [Errno 98] Address already in use errors such as:

File "onedrivesdk/helpers/GetAuthCodeServer.py", line 62, in get_auth_code
    GetAuthCodeRequestHandler)
  File "onedrivesdk/helpers/GetAuthCodeServer.py", line 78, in __init__
    HTTPServer.__init__(self, server_address, RequestHandlerClass)
  File "/usr/lib/python2.7/SocketServer.py", line 417, in __init__
    self.server_bind()
  File "/usr/lib/python2.7/SocketServer.py", line 431, in server_bind
    self.socket.bind(self.server_address)
  File "/usr/lib/python2.7/socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 98] Address already in use

[earonesty]

merged into onedrive_fork (https://github.com/AtakamaLLC/onedrive-sdk-python)