Set the named container to be launched at boot

    CLI Example:

    .. code-block:: bash

        salt myminion nspawn.enable <name>

def enable(name):
    '''
    Set the named container to be launched at boot

    CLI Example:

    .. code-block:: bash

        salt myminion nspawn.enable <name>
    '''
    cmd = 'systemctl enable systemd-nspawn@{0}'.format(name)
    if __salt__['cmd.retcode'](cmd, python_shell=False) != 0:
        __context__['retcode'] = salt.defaults.exitcodes.EX_UNAVAILABLE
        return False
    return True