RFR: 8304834: Fix wrapper insertion in TestScaffold.parseArgs(String args[])

[Leonid Mesnik]

The TestScaffold incorrectly parse options, it should insert wrapper class between VM options and applications classame.

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Commit messages:
 - parsing updted
 - problemlist fixed
 - comments
 - fix

Changes: https://git.openjdk.org/jdk/pull/13170/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13170&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304834
  Stats: 34 lines in 2 files changed: 20 ins; 10 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/13170.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13170/head:pull/13170

PR: https://git.openjdk.org/jdk/pull/13170