def gcp_revoke_authentication(self):
self._validate_key_set()<EOL>self.log.info("<STR_LIT>")<EOL>self.execute_cmd(['<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT>'.format(self.project_id)])<EOL>self.execute_cmd(<EOL>['<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT:none>', '<STR_LIT>'.format(self.project_id)]<EOL>)<EOL>
Change default authentication to none - which is not existing one.