The fix updates the tests to use dynamic port launching debuggee and get the listening port from the debugee output
------------- Commit messages: - Fixed AttachingConnector tests Changes: https://git.openjdk.java.net/jdk/pull/4817/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4817&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8213714 Stats: 130 lines in 4 files changed: 63 ins; 41 del; 26 mod Patch: https://git.openjdk.java.net/jdk/pull/4817.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/4817/head:pull/4817 PR: https://git.openjdk.java.net/jdk/pull/4817
