This patch adds timeouts to usb_stor_control_msg().  Now we will no longer
have to use the usb_control_msg() routine in the usb core, so all our
control messages can be interrupted by scsi aborts or disconnects.

This also includes the new serial-number for auto-REQUEST-SENSE change.
The new serial number has one bit toggled from the old, guaranteeing that
it is unique.

Following a suggestion of David Brownell, this makes the transport-reset
function attempt to clear a halt condition on both bulk pipes even if one
of them fails.