ports/155002: Update net-mgmt/mrtg to 2.17.1

[sylvio at FreeBSD.org]

Synopsis: Update net-mgmt/mrtg to 2.17.1

Responsible-Changed-From-To: freebsd-ports-bugs->sylvio
Responsible-Changed-By: sylvio
Responsible-Changed-When: Thu Feb 24 12:26:01 UTC 2011
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=155002