Make nvme(4) driver some more NUMA aware.

• For each queue pair precalculate CPU and domain it is bound to.

If queue pairs are not per-CPU, then use the domain of the device.

• Allocate most of queue pair memory from the domain it is bound to.
• Bind callouts to the same CPUs as queue pair to avoid migrations.
• Do not assign queue pairs to each SMT thread. It just wasted

resources and increased lock congestions.

• Remove fixed multiplier of CPUs per queue pair, spread them even.

This allows to use more queue pairs in some hardware configurations.

• If queue pair serves multiple CPUs, bind different NVMe devices to

different CPUs.

MFC after: 1 month
Sponsored by: iXsystems, Inc.