fix: missing import 'stat' in network.py and simple_config.py

lib/network.py

@@ -29,6 +29,7 @@ from __future__ import unicode_literals
 import time
 import queue
 import os
+import stat
 import errno
 import sys
 import random

lib/simple_config.py

@@ -7,6 +7,7 @@ import ast
 import json
 import threading
 import os
+import stat
 
 from copy import deepcopy
 from .util import user_dir, print_error, print_msg, print_stderr, PrintError
@@ -147,7 +148,6 @@ class SimpleConfig(PrintError):
         f.write(s)
         f.close()
         if 'ANDROID_DATA' not in os.environ:
-            import stat
             os.chmod(path, stat.S_IREAD | stat.S_IWRITE)
 
     def get_wallet_path(self):