Review 27251

C. Thomas Tyler
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.
#1: Change 27250 committed into //guest/perforce_software/sdp/dev 3 0 0
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