qobject: Use simpler QDict/QList scalar insertion macros

We now have macros in place to make it less verbose to add a scalar
to QDict and QList, so use them.

Patch created mechanically via:
  spatch --sp-file scripts/coccinelle/qobject.cocci \
    --macro-file scripts/cocci-macro-file.h --dir . --in-place
then touched up manually to fix a couple of '?:' back to original
spacing, as well as avoiding a long line in monitor.c.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20170427215821.19397-7-eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

qemu-io.c

@@ -601,7 +601,7 @@ int main(int argc, char **argv)
         } else {
             if (format) {
                 opts = qdict_new();
-                qdict_put(opts, "driver", qstring_from_str(format));
+                qdict_put_str(opts, "driver", format);
             }
             if (openfile(argv[optind], flags, writethrough, opts)) {
                 exit(1);