RFR: 4890732: GZIPOutputStream doesn't support, in fact thwarts, use of optional GZIP fields [v2]

[Lin Zang]

> 4890732: GZIPOutputStream doesn't support, in fact thwarts, use of optional GZIP fields

Lin Zang has updated the pull request incrementally with one additional commit since the last revision:

  add test case

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3072/files
  - new: https://git.openjdk.java.net/jdk/pull/3072/files/8cdc1fa6..533199ef

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3072&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3072&range=00-01

  Stats: 62 lines in 1 file changed: 58 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3072.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3072/head:pull/3072

PR: https://git.openjdk.java.net/jdk/pull/3072