aoe: list new maintainer for aoe driver

Justin Sanders, who has extensive experience with ATA over Ethernet
in general and AoE SCSI and block-device drivers in particular, is
ready to take on the role of aoe maintainer.  The driver needs a more
active maintainer.

Signed-off-by: Ed Cashin <ed.cashin@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>