net-mgmt/xymon-server: Import patches from Debian
Development of Xymon has slowed, but is not abandoned. Debian has
accumulated several patches that have not made it into a release yet
which we should import.
- Fix bbcombotest: "Could not access hobbitd board, error 0"
- Fix reading service banners from TLS-1.3-enabled hosts
- Fix Snapshot and Availability Report on Firefox
- Fix buffer overflow in md5hash