ports/157607: Fix port: mail/dovecot should use USERS, directory reshuffle

[crees at FreeBSD.org]

Synopsis: Fix port: mail/dovecot should use USERS, directory reshuffle

Responsible-Changed-From-To: freebsd-ports-bugs->crees
Responsible-Changed-By: crees
Responsible-Changed-When: Wed Jun 22 17:24:56 UTC 2011
Responsible-Changed-Why: 
Invalid autoassignment to pgollucci

http://www.freebsd.org/cgi/query-pr.cgi?pr=157607