osd: Include dups in copy_after() and copy_up_to()

osd: Include dups in copy_after() and copy_up_to()

Client saw out of order results in a test with a very small
pg_log because a backfill/recovery sent a small number of
log entries for duplicate checks.

Since these copy operations are equivalent to both a copy
and trim (an argument controls how many log entries
transfer), we need to include any new dups with enough
existing dups up to the configured maximum.

Fixes: http://tracker.ceph.com/issues/39304
Signed-off-by: David Zafman <dzafman@redhat.com>
(cherry picked from commit 00f279db37fc648584c4c741e0453b1d4f4320e4)

Conflicts:
	src/osd/PeeringState.cc contents in src/osd/PG.cc
	src/osd/osd_types.cc (trivial)