RFR: 8254692: (se) Clarify the behaviour of the non-abstract SelectorProvider::inheritedChannel [v2]

[Fernando Guallini]

> Please review this fix to provide spec clarity on the default implementation of
> java.nio.channels.spi.SelectorProvider::inheritedChannel() method which simply returns “null”, and a test for it.
> Please review the corresponding CSR as well: https://bugs.openjdk.java.net/browse/JDK-8254848

Fernando Guallini has updated the pull request incrementally with one additional commit since the last revision:

  move SelectorProvider default implementation tests to a new test class

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/745/files
  - new: https://git.openjdk.java.net/jdk/pull/745/files/8006f0a4..d4d50134

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=745&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=745&range=00-01

  Stats: 98 lines in 2 files changed: 70 ins; 28 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/745.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/745/head:pull/745

PR: https://git.openjdk.java.net/jdk/pull/745