RFR: 8234808: jdb quoted option parsing broken

[Alex Menkov]

Migrating this review from the mailing list into a pull request.

Some background:
when jdb launches debuggee process it passes java options from "options" value for CommandLineLaunch connector and
forward options specified before command.

The fix solves several discovered issues:
- proper handling of java options with spaces
- if both way are used to specify java options, forwarded options override options from "options" value

VMConnection class implements tricky logic for "options" field parsing for JFR needs (handling of single and double
quotes). I decided to keep it as is to avoid massive test failures with JFR (there is no test coverage for this
functionality and I'm not sure I understand all requirements).

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Commit messages:
 - 8234808: jdb quoted option parsing broken

Changes: https://git.openjdk.java.net/jdk/pull/211/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=211&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8234808
  Stats: 205 lines in 4 files changed: 190 ins; 4 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/211.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/211/head:pull/211

PR: https://git.openjdk.java.net/jdk/pull/211