JDK-8030957 : Implement OperatingSystemMXBean.getSystemCpuLoad() and .getProcessCpuLoad() on AIX

[Suchismith Roy]

Hi
I wanted to discuss about 
JDK-8030957<https://bugs.openjdk.org/browse/JDK-8030957> .
Does AIX currently not have a way to get the total CPU load ? Or does it used 
the OperatingSystemImpl.c under unix/native/libmanagement_ext ?
I see reference to implementation that reads /proc/self/psinfo on Solaris. Does 
that point to the same file under unix/ ?

Thanks
Suchismith Roy