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

[Lin Zang]

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

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Commit messages:
 - 8261131: jcmd jmap dump should not accept gz option with no value

Changes: https://git.openjdk.java.net/jdk/pull/2399/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2399&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261131
  Stats: 26 lines in 2 files changed: 19 ins; 0 del; 7 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