RFR: 8272163: Add -version option to keytool and jarsigner [v4]

[Hai-May Chao]

> It'd be useful to have a -version option for keytool and jarsigner. Many other JDK tools already have a -version option. This is to add -version option to keytool and jarsigner like jar command does.
> 
> CSR review:
> https://bugs.openjdk.java.net/browse/JDK-8275174

Hai-May Chao has updated the pull request incrementally with one additional commit since the last revision:

  Updated comment in test

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5954/files
  - new: https://git.openjdk.java.net/jdk/pull/5954/files/c0a71608..e801c6a2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5954&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5954&range=02-03

  Stats: 8 lines in 1 file changed: 6 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5954.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5954/head:pull/5954

PR: https://git.openjdk.java.net/jdk/pull/5954