net-mgmt/cacti: Update to 1.1.9

Changes: http://www.cacti.net/release_notes.php?version=1.1.8

http://www.cacti.net/release_notes.php?version=1.1.9

PR: 219854
Submitted by: Daniel Austin <freebsd-ports@dan.me.uk> (maintainer)
Approved by: garga (mentor)
Differential Revision: https://reviews.freebsd.org/D11122