colo-compare: track connection and enqueue packet

colo-compare: track connection and enqueue packet

In this patch we use kernel jhash table to track
connection, and then enqueue net packet like this:

+ CompareState ++
|               |
+---------------+   +---------------+         +---------------+
|conn list      +--->conn           +--------->conn           |
+---------------+   +---------------+         +---------------+
|               |     |           |             |          |
+---------------+ +---v----+  +---v----+    +---v----+ +---v----+
                  |primary |  |secondary    |primary | |secondary
                  |packet  |  |packet  +    |packet  | |packet  +
                  +--------+  +--------+    +--------+ +--------+
                      |           |             |          |
                  +---v----+  +---v----+    +---v----+ +---v----+
                  |primary |  |secondary    |primary | |secondary
                  |packet  |  |packet  +    |packet  | |packet  +
                  +--------+  +--------+    +--------+ +--------+
                      |           |             |          |
                  +---v----+  +---v----+    +---v----+ +---v----+
                  |primary |  |secondary    |primary | |secondary
                  |packet  |  |packet  +    |packet  | |packet  +
                  +--------+  +--------+    +--------+ +--------+

We use conn_list to record connection info.
When we want to enqueue a packet, firstly get the
connection from connection_track_table. then push
the packet to g_queue(pri/sec) in it's own conn.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>