RFR: 8253940: com/sun/jdi/JdwpAttachTest.java failed with "RuntimeException: ERROR: LingeredApp.startApp was able to attach" [v2]

[Alex Menkov]

> Failures related to "no route to host" and "cannot bind to address" errors are covered by https://git.openjdk.java.net/jdk/pull/2633
> 
> This change fixes failures with listening on IPv6 loopback and attaching to "localhost" (the test connects to some other process which listens on the same port on IPv4 loopback and as a result gets "handshake failed - received >< - expected >JDWP-Handshake<" error)

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  Updated per Chris feedback

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2654/files
  - new: https://git.openjdk.java.net/jdk/pull/2654/files/fe12d328..2cf7031a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2654&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2654&range=00-01

  Stats: 8 lines in 1 file changed: 2 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2654.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2654/head:pull/2654

PR: https://git.openjdk.java.net/jdk/pull/2654