Feature - Add delay to NVMe device model

[Stephen Bates]

Hi

I am interested in exploring the impact of increased storage IO delay on 
applications and was thinking of doing this by adding a delay argument to the 
NVMe device model in QEMU. Is this something that others would be interested 
in? If so I would be happy to work up a patch for upstream consideration.

If this is already do-able in QEMU I would appreciate a pointer to that.

Thanks

Stephen