Change the system runlevel on sysV compatible systems

    CLI Example:

    .. code-block:: bash

        salt '*' system.init 3

def init(runlevel):
    '''
    Change the system runlevel on sysV compatible systems

    CLI Example:

    .. code-block:: bash

        salt '*' system.init 3
    '''
    cmd = ['init', '{0}'.format(runlevel)]
    ret = __salt__['cmd.run'](cmd, python_shell=False)
    return ret