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

[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)).

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

Commit messages:
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/16930/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16930&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321131
  Stats: 18 lines in 4 files changed: 18 ins; 0 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