this property returns the deployment label dictionary (mainly used by
        stage description)

def deployment_label(self):
        '''
        this property returns the deployment label dictionary (mainly used by
        stage description)
        '''
        label = dict()

        label['swagger_info_object'] = self.info
        label['api_name'] = self.rest_api_name
        label['swagger_file'] = os.path.basename(self._swagger_file)
        label['swagger_file_md5sum'] = self.md5_filehash

        return label