Change the default group of the user

    CLI Example:

    .. code-block:: bash

        salt '*' user.chgid foo 4376

def chgid(name, gid):
    '''
    Change the default group of the user

    CLI Example:

    .. code-block:: bash

        salt '*' user.chgid foo 4376
    '''
    pre_info = info(name)
    if not pre_info:
        raise CommandExecutionError(
            'User \'{0}\' does not exist'.format(name)
        )
    if gid == pre_info['gid']:
        return True
    cmd = ['usermod', '-g', gid, name]
    __salt__['cmd.run'](cmd, python_shell=False)
    return info(name).get('gid') == gid