RFR: 8218685: jlink --list-plugins needs to be readable and tidy

[Ian Graves]

On Wed, 23 Sep 2020 15:48:46 GMT, Ian Graves <igraves at openjdk.org> wrote:

>> Can we put a base abstract class in jdk.tools.jlink.internal.plugins that implements getUsage. That would avoid needing
>> to have the same getUsage method in all the plugins.
>> The text in the value of some of the .usage keys looks like it will wrap significantly, can the values of
>> release-info.usage and strip-native-debug-symbols.usage be re-formatted so that the usage is readable with a default
>> terminal?
>
> I'll shrink narrow those descriptions down to 80 characters.
> 
> As to the abstract class, I think it'd make sense to have that implement getUsage, getName, and getDescription --
> essentially combine all of those very similar things in the same place.

Updated to consolidate documentation/resource-related methods into an abstract base class and shortened the mentioned
usage bodies to 80 chars or less.

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PR: https://git.openjdk.java.net/jdk/pull/305