RFR: JDK-8292066 Convert TestInputArgument.sh and TestSystemLoadAvg.sh to java version

[Bill Huang]

On Thu, 11 Aug 2022 21:12:08 GMT, Bill Huang <duke at openjdk.org> wrote:

> This task converts 2 shell tests to java version. 
> test/java/lang/management/OperatingSystemMXBean/TestSystemLoadAvg.sh 
> test/java/lang/management/RuntimeMXBean/TestInputArgument.sh

@lmesnik Could you please review this PR?

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PR: https://git.openjdk.org/jdk/pull/9848