Leverage `appbundle` DSL

This PR updates all projects to take advantage of the `appbundle` function that has been added to the Omnibus's builder DSL: https://github.com/opscode/omnibus/pull/342

Passing CI runs:

* [x] - ChefDK - http://manhattan.ci.opscode.us/job/chefdk-trigger-ad_hoc/294/downstreambuildview/
* [x] - Chef Client - http://ci.opscode.us/job/chef-client-build/1772/

/cc @opscode/release-engineers @opscode/client-engineers