MFH: r537587 r537837

mail/dovecot: restore the REINPLACE_CMD for the example config.

Overzealous removal.

PR: 246947
Submitted by: gwbr0601@yahoo.de
Pointy Hat To: ler

mail/dovecot: fix example config *.conf.ext REINPLACE missed in r537587.

PR: 246963
Submitted by: kfv@irbug.org

Approved by: ports-secteam (joneum)