[RFC PATCH] use sulogin in single-user mode

[Bill Nottingham]

We have an existing bug where if you're in single-user mode, and
SELinux is active, various commands don't print to the console.
The root of this is the single-user shell isn't running in the
right SELinux context, as there's nothing to distinguish this from
the 'normal' shells run during bootup.

By far, the simplest fix is to run something that starts a shell
via a 'normal' login-ish mechanism. Hence, the attached patch
that switches to sulogin for single user mode.

However, this changes behavior that has existed since the dawn
of time in Red Hat/Fedora systems; with this change, single-user
mode would now require the root password. This is both when
booting with 'linux single/linux S', or going to runlevel 1
with 'telinit 1'.

Comments?

Bill