RFR: 8281175: Add a -providerPath option to jarsigner [v2]

[Hai-May Chao]

On Thu, 3 Feb 2022 18:32:42 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Add the `-providerPath` option to jarsigner to be consistent with keytool.
>
> Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   no need to append to null

Code change looks good to me.
I have a comment on the CSR. The “Options for jarsigner” section in `jarsigner` manpage, where it describes `-digestalg algorithm` and `-sigalg algorithm`, we would update it to include this new option `-providerPath` there.

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PR: https://git.openjdk.java.net/jdk/pull/7338