RFR: 8287580: (se) CancelledKeyException during channel registration [v3]

[Brian Burkhalter]

> Ignore `CancelledKeyException` during registration.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8287580: Revert change to AbstractSelectableChannel; reduce iterations in test

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8978/files
  - new: https://git.openjdk.java.net/jdk/pull/8978/files/92533644..98bcd22e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8978&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8978&range=01-02

  Stats: 7 lines in 2 files changed: 1 ins; 3 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8978.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8978/head:pull/8978

PR: https://git.openjdk.java.net/jdk/pull/8978