Include qapi/qmp/qlist.h exactly where needed

This cleanup makes the number of objects depending on qapi/qmp/qlist.h
drop from 4551 (out of 4743) to 16 in my "build everything" tree.

While there, separate #include from file comment with a blank line.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180201111846.21846-12-armbru@redhat.com>
diff --git a/tests/libqtest.c b/tests/libqtest.c
index 0ec8af2..16d6081 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -12,8 +12,8 @@
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
- *
  */
+
 #include "qemu/osdep.h"
 #include "libqtest.h"
 
@@ -25,6 +25,7 @@
 #include "qapi/qmp/json-parser.h"
 #include "qapi/qmp/json-streamer.h"
 #include "qapi/qmp/qjson.h"
+#include "qapi/qmp/qlist.h"
 
 #define MAX_IRQ 256
 #define SOCKET_TIMEOUT 50