RFR: 8286032: keytool -list -alias should not assume it is always a certificate [v2]

[Hai-May Chao]

> This fix the warnings of the keytool -list -alias for a secret key that was created with a legacy algorithm.

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

  Update with Weijun's comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29250/files
  - new: https://git.openjdk.org/jdk/pull/29250/files/8a528500..06ef1f7c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29250&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29250&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/29250.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29250/head:pull/29250

PR: https://git.openjdk.org/jdk/pull/29250