RFR: 8257722: Improve "keytool -printcert -jarfile" output [v4]

[Hai-May Chao]

On Thu, 28 Oct 2021 21:13:40 GMT, Hai-May Chao <hchao at openjdk.org> wrote:

>> This change does a few improvements to the output of `keytool -printcert -jarfile` command to help readability and diagnosis.
>
> Hai-May Chao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update while block code

It'd be worry-free by keeping the same ordering. Changed as suggested. Thanks for the review!

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PR: https://git.openjdk.java.net/jdk/pull/6126