RFR 8242260: Remove customizable ContentSigner from jarsigner

[Weijun Wang]

mach5 passed.

> On Apr 14, 2020, at 3:27 PM, Weijun Wang <weijun.wang at oracle.com> wrote:
> 
> After some discussion, we decide to keep the classes in JDK 15 but add a `forRemoval=true` argument. Related jarsigner help screen and warning message are also updated.
> 
> Please review everything updated at:
> 
>  Release note : https://bugs.openjdk.java.net/browse/JDK-8242261
>           CSR : https://bugs.openjdk.java.net/browse/JDK-8242262
>        webrev : http://cr.openjdk.java.net/~weijun/8242260/webrev.01/ (a new URL!)
> 
> Thanks,
> Max
> 
>> On Apr 7, 2020, at 4:04 PM, Weijun Wang <weijun.wang at oracle.com> wrote:
>> 
>> I am thinking about removing the `jarsigner -altsigner -altsignerpath` options and underlying classes:
>> 
>>           JBS : https://bugs.openjdk.java.net/browse/JDK-8242260
>> 
>> Please review everything at:
>> 
>>  Release note : https://bugs.openjdk.java.net/browse/JDK-8242261
>>           CSR : https://bugs.openjdk.java.net/browse/JDK-8242262
>>        webrev : http://cr.openjdk.java.net/~weijun/8242260/webrev.00/
>> 
>> The CSR "Problem" section has more info on why it's better to remove it now.
>> 
>> Thanks,
>> Max
>> 
>