RFR: 8275640 (win) java.net.NetworkInterface issues with IPv6-only environments [v2]

[Daniel Jeliński]

> Clean up of various issues related to error handling and memory management

Daniel Jeliński has updated the pull request incrementally with one additional commit since the last revision:

  Restore support for IPv6-only operation

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6090/files
  - new: https://git.openjdk.java.net/jdk/pull/6090/files/712c97cc..f440a6e0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6090&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6090&range=00-01

  Stats: 8 lines in 2 files changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6090.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6090/head:pull/6090

PR: https://git.openjdk.java.net/jdk/pull/6090