Return server version (``apachectl -v``)

    CLI Example:

    .. code-block:: bash

        salt '*' apache.version

def version():
    '''
    Return server version (``apachectl -v``)

    CLI Example:

    .. code-block:: bash

        salt '*' apache.version
    '''
    cmd = '{0} -v'.format(_detect_os())
    out = __salt__['cmd.run'](cmd).splitlines()
    ret = out[0].split(': ')
    return ret[1]