[jdk25u] RFR: 8361253: CommandLineOptionTest library should report observed values on failure

[Jayashree S Kumar]

A clean backport for [JDK-8361253](https://bugs.openjdk.org/browse/JDK-8361253)

This patch is to make CommandLineOptionTest library report observed values on failure rather than only report expected value when failing.

Backporting this patch can help fix debugging gap. 

Testing: mach5 tier1,tier2,tier3 & Oracle internal testing

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Commit messages:
 - Backport f153e415d740f4ede272929171e9bb3e73ddbe1c

Changes: https://git.openjdk.org/jdk25u/pull/231/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=231&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361253
  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk25u/pull/231.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/231/head:pull/231

PR: https://git.openjdk.org/jdk25u/pull/231