RFR: JDK-8292066 Convert TestInputArgument.sh and TestSystemLoadAvg.sh to java version [v3]

[Bill Huang]

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

Bill Huang has updated the pull request incrementally with one additional commit since the last revision:

  Implemented more review comments.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9848/files
  - new: https://git.openjdk.org/jdk/pull/9848/files/21e7ce84..9ae1663d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9848&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9848&range=01-02

  Stats: 19 lines in 1 file changed: 2 ins; 8 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/9848.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9848/head:pull/9848

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