add lwqq_msg_check_member_chg

当发现接受消息的info_seq不匹配时,重新加载好友列表,并触发group_member_chg
事件

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix member list duplicated when use get_discu_info many times

Signed-off-by: xiehuc <xiehuc@gmail.com>