ormat a command to run inside a container using the runtime

        :param container: The name or ID of the container in which to run
        :type container: ``str``

        :param cmd: The command to run inside `container`
        :type cmd: ``str``

        :param quotecmd: Whether the cmd should be quoted.
        :type quotecmd: ``bool``

        :returns: Formatted string to run `cmd` inside `container`
        :rtype: ``str``
        z%s %s %s)