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

[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

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Commit messages:
 - Updated copyright header.
 - Converted TestInputArgument.sh to java version.
 - Coverted TestSystemLoadAvg shell test to java version.

Changes: https://git.openjdk.org/jdk/pull/9848/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9848&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292066
  Stats: 200 lines in 4 files changed: 43 ins; 144 del; 13 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