removes maven dir in output shadow jar

[krageon]

I think this is okay as I cannot find a reference to it either in the code or in the dependencies of any of the build stages (transitive or otherwise).

[krageon]

This fixes #1990 . It's been a few years since I did java things so my tooling fu is admittedly a little weak. If I missed something I'd like to figure out what that is. Thanks :)

[tomakehurst]

I'm wondering if we can just cut the whole META-INF/maven directory. I'm not sure it's serving any purpose, even for the dependencies that are actually present.

[krageon]

This was my initial resolution, but I figured I'd leave the changes to the minimum required to get things resolved. I'm perfectly willing to remove the whole thing, so I will do that after I eat. An hour or so.

[krageon]

@tomakehurst all done chief

[krageon]

I've done a little test with a simple mapping

{
    "request": {
        "method": "GET",
        "url": "/simple"
    },
    "response": {
        "status": 200,
        "body": "Hello world!",
        "headers": {
            "Content-Type": "text/plain"
        }
    }
}

Which still works