cleanup py2 compatibility imports

gui/qt/network_dialog.py

@@ -23,14 +23,8 @@
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import socket
-import six
+
 from PyQt5.QtGui import *
 from PyQt5.QtCore import *
 import PyQt5.QtCore as QtCore