slirp: Add info usernet for dumping connection states

Break out sockstats from the slirp statistics and present them under the
new info category "usernet". This patch also improves the current output
/wrt proper reporting connection source and destination.

Signed-off-by: Jan Kiszka <[email protected]>
Signed-off-by: Anthony Liguori <[email protected]>
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index 34f6992..359bdc6 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -87,6 +87,8 @@
 show CPU statistics
 @item info slirp
 show SLIRP statistics (if available)
+@item info usernet
+show user network stack connection states
 @item info migrate
 show migration status
 @item info balloon