Removed all references to journals.rep value for
journalPrefix for journalcopy replicas.
P4D 2018.1+ is now required for creating standby
replicas.
Note that the SDP validator (new in a coming SDP release)
will help spot journals.rep usage that should be
converted when upgrading to 2018.1 fo P4D/SDP.
To Do: Rewite the 'seed' stuff to use mkdirs.sh instead.