Introducing systemd-ask-password module which is used to query a
system password or passphrase from the user.
This module can be used standalone ( systemd-ask-password )
( which is without plymouth & wall support )
With plymouth module ( systemd-ask-password + plymouth )
With wall module ( systemd-ask-password + wall ), which is currently
commented out since there is no forceable usecase for it or even exiting
wall module.
This is a standalone systemd module which means it depends on no other module than systemd.