Allow stopping wal senders to be invovled in SyncRepReleaseWaiters() also.

When Who What
2018-11-29 00:16:31 Michael Paquier (michael-kun) Changed reviewers to Michael Paquier (michael-kun)
2018-11-29 00:16:24 Michael Paquier (michael-kun) Closed in commitfest 2019-01 with status: Committed
2018-11-29 00:16:24 Michael Paquier (michael-kun) Changed committer to michael-kun
2018-11-23 01:58:53 Paul Guo (paulguo-pivotal) Changed authors to Paul Guo (paulguo-pivotal)
2018-11-23 01:57:54 Paul Guo (paulguo-pivotal) Attached mail thread CAEET0ZEv8VFqT3C-cQm6byOB4r4VYWcef1J21dOX-gcVhCSpmA@mail.gmail.com
2018-11-23 01:57:54 Paul Guo (paulguo-pivotal) Created patch record