add glusterfs into the ports tree
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194409
Credit and hats off to;
Baptiste Daroussin <bapt@freebsd.org> and the FreeNAS team for the original work.
Hiroki Sato <hrs@FreeBSD.org>
Harshavardhana <harsha@harshavardhana.net>
Marin Bernard <marin@olivarim.com>
Nils Beyer <nbe@renzel.net>
andrew@rinet.ru
Nick Evans <nevans@talkpoint.com>
KIKUCHI Koichiro <oi4io5me.cesium3@gmail.com>