dpkg provider cleanup

- :update and :install are now treated the same way and throw the
  same exceptions
- :remove and :purge don't require the source at all, so don't do
  any checking on that
- fix some convoluted side-effecty logic in load_current_resource
- load_current_resource now correctly gets the dpkg state on
  :remove and :purge when the file does not exist (pretty sure
  the old logic did not)
- fixed the FIXME about using en_US.UTF-8 (the default for shell_out!)
- just use shell_out! to throw exceptions
- clean up all the specs and remove all the instance vars from the code

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