1165404 - document default host name in conusmer.conf

Default behavior is socket.gethostname().  Modifying conf file to reflect this, as was done in [BZ-1165346](https://bugzilla.redhat.com/show_bug.cgi?id=1165346)

[BZ-1165404](https://bugzilla.redhat.com/show_bug.cgi?id=1165404)
I think it would be better to put this comment in the "host" section of the comment block above this (see line 7).