OpenDJ doc specify "localhost" as default

[Marsonge]

The current code can return an IP or hostname instead of localhost, which means that using a script in local on a server which only listens to 127.0.0.1 can fail without the -h flag.

Forgerock's OpenDJ is pretty clear about it: the default value is "localhost.localdomain". However, using the full "localhost.localdomain" string seems to not work for at least some of the scripts, if not all of them; thus, I highly recommend using solely "localhost".

This solves multiple problems:

• Retrocompatibility issues with servers migrating to OpenIdentity's OpenDJ that bind their server to localhost but do not use the hostname flag in their scripts
• Avoids a discrepancy between OpenIdentity's OpenDJ and Forgerock's documentation
• Avoids unpredictable behaviour when there are multiple network cards on a machine: the former code could pull any IP address from there, meaning the IP address used couldn't be reliably known.