RFR - JDK-8209517: com/sun/jdi/BreakpointWithFullGC.java fails with timeout

[Alex Menkov]

Hi all,

please review a fix for
https://bugs.openjdk.java.net/browse/JDK-8209517
webrev:
http://cr.openjdk.java.net/~amenkov/sh2java/step1_regression/webrev/

Cause of the BreakpointWithFullGC failures is a mess of jdb and debuggee 
outputs (the test runs debuggee by using CommandLineLaunch connector, so 
jdb redirects debuggee stdout to its own stdout).
To solve it test framework was updated to launch debuggee first 
(redirecting its output) and then connecting jdb to existing process.
The approach allow to drop "simple prompt" logic (jdb mode when debugee 
is not yet running).

Mach5 passed 400 runs ("4 std platforms" x "--test-repeat 100") without 
any issues.

--alex