tcp_comp: add sysctl for enable/disable compression

hulk inclusion
category: feature
bugzilla: NA
CVE: NA

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Add sysctl interface for enable/disable tcp compression by ports.

Example:

$ echo 4000 > /proc/sys/net/ipv4/tcp_compression_ports
will enable port 4000 for tcp compression

$ echo 4000,5000 > /proc/sys/net/ipv4/tcp_compression_ports
will enable both port 4000 and 5000 for tcp compression

$ echo > /proc/sys/net/ipv4/tcp_compression_ports
will disable tcp compression.

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>