MFH: r446709

net-mgmt/cacti: Update to 1.1.15

Changes: https://www.cacti.net/release_notes.php?version=1.1.14

		https://www.cacti.net/release_notes.php?version=1.1.15

PR: 221013
Submitted by: Daniel Austin <freebsd-ports@dan.me.uk> (maintainer)

Approved by: ports-secteam (with hat)