networking.xml: fix tcp keepalive meaning
networking.xml: fix tcp keepalive meaning

Refer to http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html

Signed-off-by: Chengwei Yang <7e0623afadd0aa58c06838a736222d073dafaa0b@qiyi.com>

rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website