Allows user to access /dev/net/tun
--- twisted/pair/test/test_tuntap.py.orig	2014-05-27 22:55:56.230232748 -0400
+++ twisted/pair/test/test_tuntap.py		2014-05-27 23:30:02.769956742 -0400
@@ -10,7 +10,7 @@
 import os
 import struct
 import socket
-from errno import EPERM, EBADF, EINVAL, EAGAIN, EWOULDBLOCK, ENOENT, ENODEV
+from errno import EPERM, EBADF, EINVAL, EAGAIN, EWOULDBLOCK, ENOENT, ENODEV, EACCES
 from random import randrange
 from collections import deque
 from itertools import cycle
@@ -582,8 +582,11 @@
         except OSError as e:
             # The device file may simply be missing.  The device file may also
             # exist but be unsupported by the kernel.
-            if e.errno in (ENOENT, ENODEV) and filename == b"/dev/net/tun":
-                raise SkipTest("Platform lacks /dev/net/tun")
+            if filename == b"/dev/net/tun":
+                if e.errno in (ENOENT, ENODEV):
+                    raise SkipTest("Platform lacks /dev/net/tun")
+                elif e.errno == EACCES:
+                    raise SkipTest("Access denied opening /dev/net/tun")
             raise