RFR: 8283620: System.out does not use the encoding/charset specified in the Javadoc [v2]

[Naoto Sato]

> Promoting the internal system properties for `System.out` and `System.err` so that users can override the encoding used for those streams to `UTF-8`, aligning to the `Charset.defaultCharset()`. A CSR has also been drafted.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Modified the spec for the new system properties.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8270/files
  - new: https://git.openjdk.java.net/jdk/pull/8270/files/9ef42917..b5bcb870

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8270&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8270&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8270.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8270/head:pull/8270

PR: https://git.openjdk.java.net/jdk/pull/8270