RFR: 1197: Label changes from java.nio.** as nio

[Pavel Rappo]

Please review this PR which adds a mailing list rule for New I/O (NIO). The change was tested as per https://mail.openjdk.java.net/pipermail/jdk-dev/2020-August/004662.html

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.java.net/skara/pull/1225/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1225&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1197
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/1225.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1225/head:pull/1225

PR: https://git.openjdk.java.net/skara/pull/1225