RFR: 8272163: Add -version option to keytool and jarsigner

[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.

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Commit messages:
 - 8272163: Add -version option to keytool and jarsigner

Changes: https://git.openjdk.java.net/jdk/pull/5954/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5954&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272163
  Stats: 117 lines in 6 files changed: 116 ins; 0 del; 1 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