RFR: JDK-8234808: jdb quoted option parsing broken

[Alex Menkov]

Hi all,

please review the fix for
https://bugs.openjdk.java.net/browse/JDK-8234808
webrev:
http://cr.openjdk.java.net/~amenkov/jdk16/jdb_options/webrev/

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).

--alex