Add run support.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Add a kernel log buffer

This is handy when your laptop keeps overrunning your screen.

cat '#c/kmesg' > '#r/xyz' to put it somewhere.

If you just cat it, it never ends. Sorry. I tried.

Signed-off-by: Ronald G. Minnich <rminnich@google.com>