REORG: connection: move the target pointer from si to connection

The target is per connection and is directly used by the connection, so
we need it there. It's not needed anymore in the SI however.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index 3cdba8d..7728616 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -125,7 +125,7 @@
 {
 	/* we have a dedicated I/O handler for the stats */
 	stream_int_register_handler(&s->si[1], &cli_applet);
-	copy_target(&s->target, &s->si[1].target); // for logging only
+	copy_target(&s->target, &s->si[1].conn.target); // for logging only
 	s->si[1].conn.data_ctx = s;
 	s->si[1].applet.st1 = 0;
 	s->si[1].applet.st0 = STAT_CLI_INIT;