Adjusted JournalPrefix standard to account for shared /hxdepots.
The JournalPrefix standard now allows for unfiltered replicas
(such as HA/DR replicas) to use same journalPrefix value as filtered
replicas and edge servers, using per-ServerID checkpoints folder,
if they share the same /hxdepots (e.g. NFS-mounted) with the master
(e.g. when lbr.replication=shared).
Related code change made to mkdirs.sh and mkrep.sh to support the
tweaks to the standard.