Fix UDP and DNS support on Python 2.7 with tproxy method
Fix UDP and DNS support on Python 2.7 with tproxy method

There was runtime failure on UDP or DNS processing, because "socket" was redefined to PyXAPI's socket_ext in tproxy.py, but still was plain Python's socket in client.py
Fixed https://github.com/sshuttle/sshuttle/issues/134 for me

sshuttle/sshuttle,sshuttle/sshuttle