refactor some protocol message sending in walsender and basebackup

When Who What
2022-07-06 06:51:49 Peter Eisentraut (petere) Closed in commitfest 2022-07 with status: Committed
2022-07-06 06:51:49 Peter Eisentraut (petere) Changed committer to petere
2022-07-01 21:36:59 Nathan Bossart (bossartn) New status: Ready for Committer
2022-06-30 00:02:47 Nathan Bossart (bossartn) Added bossartn as reviewer
2022-06-27 18:42:00 Peter Eisentraut (petere) Changed authors to Peter Eisentraut (petere)
2022-06-27 18:41:50 Peter Eisentraut (petere) Attached mail thread 7e4fdbdc-699c-4cd0-115d-fb78a957fc22@enterprisedb.com
2022-06-27 18:41:49 Peter Eisentraut (petere) Created patch record