Simplify final sync in pg_rewind's target folder and add --no-sync

When Who What
2018-07-10 00:07:52 Michael Paquier (michael-kun) Closed in commitfest 2018-07 with status: Committed
2018-07-10 00:07:52 Michael Paquier (michael-kun) Changed committer to michael-kun
2018-07-09 13:38:34 Heikki Linnakangas (heikki) Added heikki as reviewer
2018-07-09 13:38:28 Heikki Linnakangas (heikki) New status: Ready for Committer
2018-03-25 12:28:48 Michael Paquier (michael-kun) Changed authors to Michael Paquier (michael-kun)
2018-03-25 12:28:41 Michael Paquier (michael-kun) Attached mail thread 20180325122607.GB3707@paquier.xyz
2018-03-25 12:28:40 Michael Paquier (michael-kun) Created patch record