s4:provision.py - try to use other addresses than "127.0.0.x" and "::1"
On production systems a user for sure strongly disagrees to use local IP
addresses (how should the server be accessible?). Therefore if the user didn't
specify an IP as provision option and in the "/etc/hosts" file we have at
least one not-local IP which resolves to our hostname use this or one of them.
Notice: if a host has more public IP addresses with the same name assigned the
behaviour is non-deterministic (well, okay - by the entries order it is). But
then the user is invited to specify the host IP manually.
This should address bug #5484.