RFR: 8353749: Improve security warning when using JKS or JCEKS keystores [v5]

[Hai-May Chao]

> This PR improves security warning when using JKS or JCEKS keystores.

Hai-May Chao has updated the pull request incrementally with one additional commit since the last revision:

  separate debug.println output

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27624/files
  - new: https://git.openjdk.org/jdk/pull/27624/files/af301060..9f3d6ca4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27624&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27624&range=03-04

  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27624.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27624/head:pull/27624

PR: https://git.openjdk.org/jdk/pull/27624