buf_ring: Add a threaded test

Add a threaded test for buf_ring.h used to help find issues with it on
architectures with a weak memory order.

Sponsored by: Arm Ltd
Differential Revision: https://rev

buf_ring: Add a threaded test

Add a threaded test for buf_ring.h used to help find issues with it on
architectures with a weak memory order.

Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D46158

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