Log file compression was happening every 24 hours but the exact time was
depending on when Gerrit was started. First execution was 1 hour after
Gerrit is started and then every 24 hours. This behavior could confuse
Gerrit administrators because it looks like log compression is random.
Since logs are rotated upon first logging event after midnight,
compressing logs at 11:00pm should give enough time for all logs to
rotate, worst case they will be compressed the day after.
Change-Id: I81d4df8c57996a483378f6107cd6db561fa0d670
2f46364950