Have HTCondor-CE advertise its current version.
Use 'unshare' to allow the HTCondor-CE processes to have a different
hostname from the rest of the system.

This allows the HTCondor-CE to function on systems where the default
system hostname differs from the one used on the public Internet
(common on dual-networked hosts).

The hostname is controlled by setting the environment variable
$CONDORCE_HOSTNAME in /etc/sysconfig/condor-ce.
Version bump for 1.6 build.