Run all the munin plugins

    CLI Example:

    .. code-block:: bash

        salt '*' munin.run_all

def run_all():
    '''
    Run all the munin plugins

    CLI Example:

    .. code-block:: bash

        salt '*' munin.run_all
    '''
    plugins = list_plugins()
    ret = {}
    for plugin in plugins:
        ret.update(run(plugin))
    return ret