RFR: 8281234: The -protected option is not always checked in keytool and jarsigner

[Weijun Wang]

The option means there is no need to provide a password when loading a keystore. In some places in jarsigner and keytool, even with the option specified, password is still prompted for or warnings are still shown.

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Commit messages:
 - 8281234: The -protected option is not always checked in keytool and jarsigner

Changes: https://git.openjdk.java.net/jdk/pull/7339/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7339&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281234
  Stats: 198 lines in 4 files changed: 194 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7339.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7339/head:pull/7339

PR: https://git.openjdk.java.net/jdk/pull/7339