ports/157606: Fix port: mail/dovecot2 should use USERS

[edwin at FreeBSD.org]

Synopsis: Fix port: mail/dovecot2 should use USERS

Responsible-Changed-From-To: freebsd-ports-bugs->pgollucci
Responsible-Changed-By: edwin
Responsible-Changed-When: Sat Jun 4 12:00:50 UTC 2011
Responsible-Changed-Why: 
pgollucci@ wants his PRs (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=157606