Start Riak

    CLI Example:

    .. code-block:: bash

        salt '*' riak.start

def start():
    '''
    Start Riak

    CLI Example:

    .. code-block:: bash

        salt '*' riak.start
    '''
    ret = {'comment': '', 'success': False}

    cmd = __execute_cmd('riak', 'start')

    if cmd['retcode'] != 0:
        ret['comment'] = cmd['stderr']
    else:
        ret['comment'] = cmd['stdout']
        ret['success'] = True

    return ret