tmpfiles: ignore all files starting with systemd-

systemd recently moved creation of /run/nologin to systemd-nologin.conf

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
tmpfiles: add support for --boot option

For compatibility with systemd-tmpfiles.

Fixes #17

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
tmpfiles.dev: remove --remove option

For compatibility with systemd.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>