(SERVER-2941) Remove unused jackson-afterburner dep
(SERVER-2941) Remove unused jackson-afterburner dep

We pulled in this dependency when we though we were going to use
multijson/jrjackson for JSON parsing. When that wound up not being
feasible, we gave up on that effort, but left this dependency in. This
commit removes it.

puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppet-server,puppetlabs/puppetserver,puppetlabs/puppetserver