no need to retry oustanding requests when terminating a session

[avg]

Summary

CAM_REQ_ABORTED sounds natural for aborting outstanding requests
when tearing down a session, but that status actually causes the
requests to be tried again. And that's completely useless.
So, I propose to use CAM_DEV_NOT_THERE or maybe some other status
that is not retriable.
This should affect only the session termination.

[mav]

Looks good to me.