Issue #22: Try IPv4 as well as IPv6 when port is not open on IPv6.
Issue #22: Try IPv4 as well as IPv6 when port is not open on IPv6.

With this change, paramiko tries the next address family when the connection
gets refused or the target port is unreachable.

jorik041/paramiko,toby82/paramiko,fvicente/paramiko,redixin/paramiko,davidbistolas/paramiko,esc/paramiko,dlitz/paramiko,ameily/paramiko,rcorrieri/paramiko,reaperhulk/paramiko,thusoy/paramiko,varunarya10/paramiko,SebastianDeiss/paramiko,remram44/paramiko,jaraco/paramiko,zarr12steven/paramiko,mirrorcoder/paramiko,mhdaimi/paramiko,anadigi/paramiko,zpzgone/paramiko,digitalquacks/paramiko,thisch/paramiko,CptLemming/paramiko,paramiko/paramiko,dorianpula/paramiko,torkil/paramiko,Automatic/paramiko