s4:dsdb Use replPropertyMetaData as the basis for msDS-KeyVersionNumber

s4:dsdb Use replPropertyMetaData as the basis for msDS-KeyVersionNumber

This means that the existing kvno will no longer be valid, all
unix-based domain members may need to be rejoined, and
upgradeprovision run to update the local kvno in
secrets.ldb/secrets.keytab.

This is required to match the algorithm used by Windows DCs, which we
may be replicating with.  We also need to find a way to generate a
reasonable kvno with the OpenLDAP backend.

Andrew Bartlett