use tunnel.sock instead of resp.fp in SSLTunnelConnection
use tunnel.sock instead of resp.fp in SSLTunnelConnection

resp.fp is a socket._fileobject instead of a socket.socket object,
so it is incompatible with gevent.
Fix issue #163

tianhao64/pyvmomi,davidmontgom/pyvmomi,chenpiao/pyvmomi,vmware/pyvmomi,higebu/pyvmomi,borland667/pyvmomi,y12uc231/pyvmomi,Infinidat/pyvmomi,rhadman/pyvmomi,spicykaiju/pyvmomi,gdowding/pyvmomi,virtdevninja/pyvmomi-ce,hartsock/pyvmomi,michaelrice/pyvmomi,serialdoom/pyvmomi,alexkolar/pyvmomi