[jdk11u-dev] RFR: 8220673: Add test library support for determining platform IP support

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.
these tests are not clean, but all added code is clean
test/jdk/java/net/NetworkInterface/Test.java
test/jdk/java/net/Socket/CloseAvailable.java
test/jdk/java/net/Socket/HttpProxy.java
test/jdk/java/net/Socket/SetSoLinger.java
test/jdk/java/nio/channels/DatagramChannel/Disconnect.java

this class is not exist, ignore, other classes are clean
test/jdk/java/nio/channels/etc/PrintSupportedOptions.java

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Commit messages:
 - Backport 0bb6328356f0f0789d1e10d32f6b66981fd68e6b
 - Backport 0bb6328356f0f0789d1e10d32f6b66981fd68e6b
 - Backport 0bb6328356f0f0789d1e10d32f6b66981fd68e6b
 - Backport 0bb6328356f0f0789d1e10d32f6b66981fd68e6b

Changes: https://git.openjdk.org/jdk11u-dev/pull/2910/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2910&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8220673
  Stats: 387 lines in 56 files changed: 284 ins; 72 del; 31 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2910.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2910/head:pull/2910

PR: https://git.openjdk.org/jdk11u-dev/pull/2910