RFR: 8321131: Console read line with zero out should zero out underlying buffer in JLine [v2]

[Naoto Sato]

> This is the fix to JLine, which makes it on par with the built-in Console fix ([JDK-8320798](https://bugs.openjdk.org/browse/JDK-8320798)).

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  moved instance fields at the top of the class

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16930/files
  - new: https://git.openjdk.org/jdk/pull/16930/files/03e07d93..a3773d44

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16930&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16930&range=00-01

  Stats: 6 lines in 1 file changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16930.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16930/head:pull/16930

PR: https://git.openjdk.org/jdk/pull/16930