pg_missing_t::add_next_event: got missing on lost_revert

Signed-off-by: Samuel Just <sam.just@inktank.com>
RepilcatedPG: handle ec pools in mark_all_unfound_lost

Fixes: #7439
Signed-off-by: Samuel Just <sam.just@inktank.com>
ReplicatedPG::prepare_pull: adjust v if most recent entry is lost_revert

Signed-off-by: Samuel Just <sam.just@inktank.com>
PGLog: when reading log, consider reverting_to for lost_revert entries

Signed-off-by: Samuel Just <sam.just@inktank.com>