Add the specified group

    CLI Example:

    .. code-block:: bash

        salt '*' group.add foo 3456

def add(name, gid=None, system=False, root=None):
    '''
    Add the specified group

    CLI Example:

    .. code-block:: bash

        salt '*' group.add foo 3456
    '''
    cmd = 'mkgroup '
    if system and root is not None:
        cmd += '-a '

    if gid:
        cmd += 'id={0} '.format(gid)

    cmd += name

    ret = __salt__['cmd.run_all'](cmd, python_shell=False)

    return not ret['retcode']