Return a list of all minions

    CLI Example:

    .. code-block:: bash

        salt '*' ret.get_minions mysql

def get_minions(returner):
    '''
    Return a list of all minions

    CLI Example:

    .. code-block:: bash

        salt '*' ret.get_minions mysql
    '''
    returners = salt.loader.returners(__opts__, __salt__)
    return returners['{0}.get_minions'.format(returner)]()