[PATCH] testsuite/psxclock: Check setting realtime clock

[chrisj at rtems.org]

Hi

This patch adds a test to make sure threads sleeping on a 
clock_nanosleep(CLOCK_REALTIME) call are not effected by a 
change in the realtime clock via the clock_settime(CLOCK_REALTIME).

The tests checks the sleeping thread's period using clock ticks.

I have checked the test and Sebastian's patch on:

 arm/xilinx_zynq_a9_qemu
 sparc/erc32
 aarch64/xilinx_zynqmp_lp64_zu3eg

Chris
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