RFR 8242260: Remove customizable ContentSigner from jarsigner

[Xuelei Fan]

I added my name to the CSR.

> On Apr 7, 2020, at 6:41 PM, Weijun Wang <weijun.wang at oracle.com> wrote:
> 
> Can you please add your name as a CSR reviewer?
> 
> Thanks,
> Max
> 
>> On Apr 8, 2020, at 9:25 AM, Xuelei Fan <xuelei.fan at oracle.com> wrote:
>> 
>> +1.
>> 
>> Xuelei
>> 
>>> On 4/7/2020 6:18 PM, Hai-May Chao wrote:
>>> Hi Max,
>>> Changes look good to me.
>>> Is there a man page bug being filed for this?
>>> Thanks,
>>> Hai-May
>>>> On Apr 7, 2020, at 1:04 AM, 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
>>>> 
>