MAINTAINERS: Replace net maintainer Mark McLoughlin with Stefan Hajnoczi

The net subsystem has lacked an active maintainer since 2009.  I have
built and tested a net-next tree to get the ball rolling again.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 30ed56d..2d219d2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -560,9 +560,10 @@
 
 Network device layer
 M: Anthony Liguori <aliguori@us.ibm.com>
-M: Mark McLoughlin <markmc@redhat.com>
+M: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
 S: Maintained
 F: net/
+T: git git://github.com/stefanha/qemu.git net
 
 Network Block Device (NBD)
 M: Paolo Bonzini <pbonzini@redhat.com>