Don't overwhelm with messages when a device is unplugged

What follows are two patches.
The first I've been carrying for a long time. The second is recent.

We see over 2 million messages of sorts when a device(s) is unplugged right in the middle of heavy I/O.

"rejecting I/O to device being removed" and "rejecting I/O to dead device"...

These are printed so many times that they cause soft-lockup on all 4 CPUs in succession!...

The following patches remedy this sad situation.

Luben