Description of problem:
When running the installer on a dual stacked system, the user is presented with
the following question:

 The server hostname resolves to more than one address:
   yyyy:yyyy:yyyy:yyyy::4
   xxx.xxx.xxx.180
 Please provide the IP address to be used for this host name:

The actual answer to this question seems to be ignored - the installer seems to
successfully configure FreeIPA listening on both v4 and v6 addresses.

Additionally, the zone file suggested by FreeIPA does not contain a AAAA
record. This is incorrect.
Version-Release number of selected component (if applicable):
3.1.3

How reproducible:
Always

Steps to Reproduce:
1. Configure IPv4 and IPv6 fully on a host
2. Install FreeIPA

Actual results:
Spurious question presented, zone file does not contain quad AAA record.

Expected results:
Installer should recognise dual-stacked configuration and generate a AAAA
record in the zone file.

Additional info:

Prometheus% telnet ds 389
Trying xxxx:xxx:x:xxx::4...
Connected to ds.
Escape character is '^]'.

[root@ds ~]# netstat -a | grep -i listen
tcp        0      0 *:kerberos              *:*                     LISTEN
tcp        0      0 *:kerberos-adm          *:*                     LISTEN
tcp        0      0 *:sunrpc                *:*                     LISTEN
tcp        0      0 *:kpasswd               *:*                     LISTEN
tcp6       0      0 [::]:kerberos           [::]:*                  LISTEN
tcp6       0      0 [::]:https              [::]:*                  LISTEN
tcp6       0      0 [::]:ldaps              [::]:*                  LISTEN
tcp6       0      0 [::]:ldap               [::]:*                  LISTEN
tcp6       0      0 [::]:sunrpc             [::]:*                  LISTEN
tcp6       0      0 [::]:webcache           [::]:*                  LISTEN
tcp6       0      0 [::]:http               [::]:*                  LISTEN
tcp6       0      0 [::]:kpasswd            [::]:*                  LISTEN