MAINTAINERS: add tree to keep parallels format driver changes

Driver changes are driving by me for now. At least we need to get
functionally complete check and repair procedure for now.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
CC: Stefan Hajnoczi <stefanha@redhat.com>

MAINTAINERS

@@ -3693,6 +3693,7 @@ S: Supported
 F: block/parallels.c
 F: block/parallels-ext.c
 F: docs/interop/parallels.txt
+T: git https://src.openvz.org/scm/~den/qemu.git parallels
 
 qed
 M: Stefan Hajnoczi <stefanha@redhat.com>