RFR: 8368692: Restrict Password::readPassword from reading from System.in [v2]

[Weijun Wang]

> A new security/system property added to determine whether Java can read password from `System.in` if a console is not available.

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

  adressing Naoto's comments; check invalid property value

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/29490/files
  - new: https://git.openjdk.org/jdk/pull/29490/files/8467453c..f01166a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29490&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29490&range=00-01

  Stats: 43 lines in 3 files changed: 17 ins; 0 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/29490.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29490/head:pull/29490

PR: https://git.openjdk.org/jdk/pull/29490