code: def list_locations(self, provider=None):
          '''
          List all available locations in configured cloud systems
          '''
          mapper = salt.cloud.Map(self._opts_defaults())
          return salt.utils.data.simple_types_filter(
              mapper.location_list(provider)
          f list_locations(self, provider=None):
          '''
          List all available locations in configured cloud systems
          '''
          mapper = salt.cloud.Map(self._opts_defaults())
          return salt.utils.data.simple_types_filter(
              mapper.location_list(provider)
          )
docs: List all available locations in configured cloud systems