RFR: 8281234: The -protected option is not always checked in keytool and jarsigner [v2]

[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.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  only expand system property if it has a name

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7339/files
  - new: https://git.openjdk.java.net/jdk/pull/7339/files/7030b908..3f23e2d9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7339&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7339&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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