MAINTAINERS: add responsible person for Parallels format driver

MAINTAINERS: add responsible person for Parallels format driver

Denis has spent 6 years working with this format in Parallels and QEMU
code was rewritten almost completely by his. Thus it would be quite
natural to add him as a maintainer and point of contact.

Patches are going to flow though Stefan's tree.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Message-id: 1440179056-12934-1-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>