tcp_comp: implement sendmsg for tcp compression

hulk inclusion
category: feature
bugzilla: NA
CVE: NA

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This patch implement software level compression for
sending tcp messages. All of the TCP payload will be
compressed before xmit.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>