RFR: 8154482: javadoc tool must support legacy doclet and taglet

[Kumar Srinivasan]

Hello,

Based on the reviews here is the second revision of the fix.
http://cr.openjdk.java.net/~ksrini/8154482/webrev.01/


Highlights of the changes:

1.  Removed the redundant undocumented option -Xnew
2. A doclet on the command lines decides the target,
     irrespective of the taglet variant, this simplifies the logic.
3. Added a new annotation based testcase execution utility,
     in the toolbox package.
4. Added more testcases, refactored the test to use toolbox utilities,
    and other simplifications.

Thanks
Kumar



> Hello,
>
> Please review  fix for:
> https://bugs.openjdk.java.net/browse/JDK-8154482
>
> Webrev at:
> http://cr.openjdk.java.net/~ksrini/8154482/webrev.00/
>
> Thanks
> Kumar
>