[IA64] sn2 maintainer update (Jes Sorensen)

We lured Jes to the dark side, and he's going to take over as the sn2
maintainer.  His experience and thoroughness will serve him well here.

Signed-off-by: Greg Edwards <edwardsg@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>