Move permissions tests to their own test group.

This moves the permissions tests to their own test group, runs the permissions tests for both the all_perms = Ture and all_perms = False cases and adds permissions tests for embed-apps and open-remote-window.
You may be able to use generate_app(https://github.com/mozilla-b2g/fxos-appgen/blob/master/fxos_appgen/generator.py#L75) for this:

generate_app(appname, details_file=details, uninstall=True, install=True, launch=True, app_type=apptype, version=version, app_path=apppath, all_perm=all_perms)

assuming all_perms is a boolean