osd/PGLog::proc_replica_log,merge_log: fix bound for last_update #12340
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If olog.tail > log.tail, olog.tail is also a bound on last_update.
See the changed comment in the commit for details.
Also adds unit tests.
Fixes: http://tracker.ceph.com/issues/18127
Signed-off-by: Samuel Just sjust@redhat.com