make multipathd disable queue_without_daemon by default

make multipathd disable queue_without_daemon by default

Once multipathd stops, there is nothing to restore access to failed
paths. Any multipath devices with no active paths that are set to
queue_if_no_path will never stop queueing, even if they were supposed
to stop after a number of retries.  This can cause shutdown to hang.
So, this patch turns off queueing by default when multipathd is stopped.
It also adds two multipathd interactive commands "forcequeueing daemon"
and "restorequeueing daemon", which override and reset this behavior,
respectively.

Unfortunately this isn't a perfect solution.  Ideally, when restarting
multipathd, you would first call "forcequeueing daemon", no make sure
that any devices that are queueing without paths continue to do so while
you are restarting the daemon. However there is no way to do this in
systemd as there was in Upstart. There is a languishing RFE that I filed
for an ExecRestartPre option in systemd. But for most users, the only
time when they need to restart multipathd is when upgrading the package,
so forcing queueing can be dealt with there.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>