MAINTAINERS: Update email address for Stefan Hajnoczi

Switch to my personal email address.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

MAINTAINERS

@@ -568,7 +568,7 @@ F: monitor.c
 
 Network device layer
 M: Anthony Liguori <aliguori@us.ibm.com>
-M: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+M: Stefan Hajnoczi <stefanha@gmail.com>
 S: Maintained
 F: net/
 T: git git://github.com/stefanha/qemu.git net
@@ -588,7 +588,7 @@ F: slirp/
 T: git git://git.kiszka.org/qemu.git queues/slirp
 
 Tracing
-M: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+M: Stefan Hajnoczi <stefanha@gmail.com>
 S: Maintained
 F: trace/
 F: scripts/tracetool.py