RFR: 8303410: Remove ContentSigner APIs and jarsigner -altsigner and -altsignerpath options [v2]

[Eirik Bjorsnos]

On Thu, 9 Mar 2023 16:41:31 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> `src/jdk.jartool/share/classes/module-info.java` and `test/jdk/TEST.groups` still reference `com.sun.jarsigner`.

Well spotted, I have removed these references.

I'm assuming the references in the jdk.compiler symbol tables will be updated through some form of automation.

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