Fetches names of all present containers from Docker.

        :return: All container names.
        :rtype: set

def get_container_names(self):
        """
        Fetches names of all present containers from Docker.

        :return: All container names.
        :rtype: set
        """
        current_containers = self.containers(all=True)
        return set(c_name[1:] for c in current_containers for c_name in c['Names'])