RFR: JDK-8293450 Convert test/closed/sun/management/ shell tests to Java version

[Bill Huang]

There is no new changes in the open portion of JDK, but extracting common functionalities in bootstrap Utils to test/lib/Utils.

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Commit messages:
 - JDK-8293450 Convert test/closed/sun/management/ shell tests to Java version

Changes: https://git.openjdk.org/jdk/pull/11029/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11029&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293450
  Stats: 453 lines in 4 files changed: 216 ins; 234 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/11029.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11029/head:pull/11029

PR: https://git.openjdk.org/jdk/pull/11029