PMT includes `._*` files when `puppet module build`ing in the `.tar.gz`

When running `bundle exec puppet module build` on a module in OSX, the module tool includes files prefixed with `._` in the tarball. You cannot get the pmt to ignore these files with the gitignore or with the pmtignore. You can easily reproduce this with the puppetdb module with a `bundle exec puppet module build`. See the linked ticket below MODULES-1917 for additional info.