shutdown: Add source information to SHUTDOWN and RESET

shutdown: Add source information to SHUTDOWN and RESET

Time to wire up all the call sites that request a shutdown or
reset to use the enum added in the previous patch.

It would have been less churn to keep the common case with no
arguments as meaning guest-triggered, and only modified the
host-triggered code paths, via a wrapper function, but then we'd
still have to audit that I didn't miss any host-triggered spots;
changing the signature forces us to double-check that I correctly
categorized all callers.

Since command line options can change whether a guest reset request
causes an actual reset vs. a shutdown, it's easy to also add the
information to reset requests.

Signed-off-by: Eric Blake <[email protected]>
Acked-by: David Gibson <[email protected]> [ppc parts]
Reviewed-by: Mark Cave-Ayland <[email protected]> [SPARC part]
Reviewed-by: Cornelia Huck <[email protected]> [s390x parts]
Message-Id: <20170515214114[email protected]>
Reviewed-by: Markus Armbruster <[email protected]>
Signed-off-by: Markus Armbruster <[email protected]>