zabbix: Convert license to SPDX format.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
htop: Add PKG_LICENSE_FILES

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
monit: add PKG_LICENSE_FILES

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
debootstrap: Add PKG_LICENSE information.

Adopted the license term "Unique" to signify a license not listed by SDPX.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
muninlite: Add PKG_LICENSE information

Signed-off-by: Ian Leonard <antonlacon@gmail.com>