selftests/futex: Use thread synchronization helpers instead of usleep()

This test uses usleep() to delay the main thread after creating the test
thread[s] under the assumption that they already are blocked on the futex
when the main thread continues.

That "works" on otherwise idle systems, but fails under load resulting in
failed selftests because the requeue operation starts before the waiters
reached the kernel.

Replace the usleep() waits by the new thread synchronization helpers to cure that.

[ tglx: Adapted to test harness changes, fixed coding style, sanitized the
	timeout handling and rewrote change log.

Co-developed-by: Edward Liaw <edliaw@google.com>
Signed-off-by: Yuwen Chen <ywen.chen@foxmail.com>
Signed-off-by: Edward Liaw <edliaw@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/tencent_76B9DE9C9FE5C57F6D74B5149970DF8CCF0A@qq.com

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