Fixes the definition of spec.files in gemspec
Fixes the definition of spec.files in gemspec

With `Dir["{app,config.lib}"]`, that only tries to find two dirs: `app`,
and `config.lib` (this one isn't real, obviously).

With the fix to `Dir["{app,config.lib}"]`, it then will search through
the app, config, and lib directories properly

djberg96/manageiq-providers-azure,djberg96/manageiq-providers-azure,durandom/manageiq-providers-azure