remove ImportError based branching

sshuttle/ssh.py

@@ -6,24 +6,13 @@ import zlib
 import imp
 import subprocess as ssubprocess
 import shlex
+from shlex import quote
 import ipaddress
-
-# ensure backwards compatiblity with python2.7
-try:
-    from urllib.parse import urlparse
-except ImportError:
-    from urlparse import urlparse
+from urllib.parse import urlparse
 
 import sshuttle.helpers as helpers
 from sshuttle.helpers import debug2
 
-try:
-    # Python >= 3.5
-    from shlex import quote
-except ImportError:
-    # Python 2.x
-    from pipes import quote
-
 
 def readfile(name):
     tokens = name.split(".")