Do not use anymore shaded version of wagon-http as it we can control commons-logging version

This page gets displayed when we throw an unhandled exception.

The exception handler ended up adding almost all the headers again,
resulting in a lot of duplicate headers.

Most critically, stapler was adding "Content-Encoding" header twice,
breaking browsers.

This version supports piping of stdout/stderr directly into
OutputStream, avoiding the need for running a thread to pump the stream.

Integrated the new version of Stapler that fixes them.

This required bridge method injector that maps boolean->void

It looks like our tests are getting bigger to the point that it needs
more PermGen space. Use fork and run with a bigger perm gen size to get
going.

(cherry picked from commit 4f0200a0)