Put all PFS hosts in the same timezone.

All the SPS hosts being delivered to Subaru expect to be (and are) running as UTC. It looks like the Subaru-commissioned hosts are HST. This difference causes trouble with logs, etc.

Since HST has no daylight savings shift, and since we cannot run as clean TAI (vs. UTC) it does not really matter which we choose. But all the PFS machines must match, and if we switch from UTC the data acquisition programs and parts of tron_actorcore will need to be modified. Work, new bugs, etc.