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

[Eirik Bjorsnos]

On Mon, 6 Mar 2023 18:52:52 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> BTW, you don't need to touch `jarsigner.1`. It is auto-generated and another team maintains the source.

Thanks, I was not aware. I have reverted the changes to this file and trust it will be updated through some other channel.

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