Module jdk.jartool should provide jarsigner tool

[Christian Stein]

Module jdk.jartoo already provides java.util.spi.ToolProvider with
sun.tools.jar.JarToolProvider. [0]

Is there a reason why it does provide a JarSignerToolProvider allowing
`jarsigner` to be run in-process? Perhaps too many System.exit() calls
in sun/security/tools/jarsigner/Main.java?

Cheers,
Christian

[0]:
https://github.com/openjdk/jdk/blob/06b33a0ad78d1577711af22020cf5fdf25112523/src/jdk.jartool/share/classes/module-info.java#L49-L50