systemd: Getty based on boot splash and utilities

[Mark Williams]

Provide a graphical getty via systemd using plymouth and the following
utilities: sh, tr, setpriv, su, true, kill, openvt, & login. Set it as the
one spawned automatically by systemd at installation.

Closes: !141
<https://gitlab.freedesktop.org/plymouth/plymouth/-/merge_requests/141>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/plymouth/attachments/20210917/a2c62264/attachment.htm>