RFR: 8303410: Remove ContentSigner

[Lance Andersen]

On Tue, 28 Feb 2023 19:09:00 GMT, Eirik Bjorsnos <duke at openjdk.org> wrote:

> The `-altsigner` and `-altsignerpath` options in JarSigner with the underlying `ContentSigner` mechanism were deprected in Java 9, for removal in Java 15. See [JDK-8076535](https://bugs.openjdk.org/browse/JDK-8076535), [JDK-8242260](https://bugs.openjdk.org/browse/JDK-8242260).
> 
> This PR suggests it's time to remove this code:
> 
> - The package `com/sun/jarsigner` is removed. This contained the `ContentSigner` and `ContentSignerParameters` along with a `package-info.java` file.
> - `JarSigner.java` is updated to remove processing of the `-altsigner` and `-altsignerpath` options and the loading and processing of the custom `ContentSigner`.
> - Similarly `c.s.s.t.jarsigner.Main` is updated to remove processing and mentioning of `-altsigner` and `-altsignerpath` options.
> - Mentions of the options in Resource files in the same directory is removed
> - The `jarsigner.1` man page is updated to remove the section on the deprecated options
> - The `Spec` and `Options` tests are update to remove usage of the `-altsigner` and `-altsignerpath` options.

> > For your spec changes, I might borrow the format I used in [JDK-8193757](https://bugs.openjdk.org/browse/JDK-8193757)
> 
> I updated the Specification section to use the list-style format from JDK-8193757. I also included a mention of the jarsigner deprectated options section.
> 
> I'm assuming the Specification section should focus on externally visible changes, not implementation-internal removals.

Thank you for the quick updates :-)

Yes the Specification section addresses the changes to the spec that impact  users

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PR: https://git.openjdk.org/jdk/pull/12791