RFR: 8261131: jcmd jmap dump should not accept gz option with no value [v2]

[Lin Zang]

> 8261131: jcmd jmap dump should not accept gz option with no value

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

  remove useless code and update copyright

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2399/files
  - new: https://git.openjdk.java.net/jdk/pull/2399/files/cebc008c..620423ef

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2399&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2399&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2399.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2399/head:pull/2399

PR: https://git.openjdk.java.net/jdk/pull/2399