Implementation of a regression test for TQ_FRONT.

Use 3 threads and 8 tasks.  Dispatch the final 3 tasks with TQ_FRONT.
The first three tasks keep the worker threads busy while we stuff the
queues.  Use msleep() to force a known execution order, assuming
TQ_FRONT is properly honored.  Verify that the expected completion
order occurs.

The splat_taskq_test5_order() function may be useful in more than
one test.  This commit generalizes it by renaming the function to
splat_taskq_test_order() and adding a name argument instead of
assuming SPLAT_TASKQ_TEST5_NAME as the test name.

The documentation for splat taskq regression test #5 swaps the two required
completion orders in the diagram.  This commit corrects the error.

Signed-off-by: Brian Behlendorf <[email protected]>

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