RFR: CODETOOLS-7903143: jtreg includes `-javaoption` values in rerun section for @compile tasks in agentvm mode.

[Jonathan Gibbons]

Please review a trivial code fix and corresponding bug fix, to address the issue that jtreg incorrectly reports inapplicable options in the rerun info for a `@compile` section.

Background, values for the `-javaoption` should only be applied when running tests (@run main, etc) and not when compiling tests (@compile, @build).   That is true when the test is executed, but not true when generating the `rerun` script.
For `othervm` it's not an issue, because the `rerun` script is more directly derived from the command that is executed, but for `agentvm` the rerun info is just a synthesized approximation.

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Commit messages:
 - CODETOOLS-7903143: jtreg includes `-javaoption` values in rerun section for @compile tasks in agentvm mode.

Changes: https://git.openjdk.java.net/jtreg/pull/67/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtreg&pr=67&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903143
  Stats: 8 lines in 8 files changed: 0 ins; 7 del; 1 mod
  Patch: https://git.openjdk.java.net/jtreg/pull/67.diff
  Fetch: git fetch https://git.openjdk.java.net/jtreg pull/67/head:pull/67

PR: https://git.openjdk.java.net/jtreg/pull/67