wintest More work to make test-s3.py work

wintest More work to make test-s3.py work

 - Set the password on the newly added 'root' user so we can connect with a user that exists in getpwnam() without further configuration
 - bind interfaces only so we don't conflict with other Samba instances
 - use the full DNS name for smbclient
 - don't connect to localhost (as we will be on ${INTERFACE_IP} only
 - Use the windows domain in the wbinfo command (winbindd won't take bare name here).
 - Register our IP address in DNS using 'net ads dns register'

Andrew Bartlett