thread: test SPDK spinlocks in an application

This exercises the parts of spdk_spin_*() that are difficult to test in
unit tests. In particular, it tests multiple SPDK threads running on
different p

thread: test SPDK spinlocks in an application

This exercises the parts of spdk_spin_*() that are difficult to test in
unit tests. In particular, it tests multiple SPDK threads running on
different pthreads contending for a lock and it tests pollers and
messages going off CPU with a lock held.

Change-Id: I5cd6ce29c92c44ba63f47332fe339e59eed81553
Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15534
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Reviewed-by: Shuhei Matsumoto <smatsumoto@nvidia.com>

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