removed xen virtualization on linux & solaris
removed xen virtualization on linux & solaris

Not related to gluster much, per request by ndevos
sachidanandaurs/planet-gluster,msvbhat/planet-gluster,sachidanandaurs/planet-gluster,msvbhat/planet-gluster,sachidanandaurs/planet-gluster,sachidanandaurs/planet-gluster,msvbhat/planet-gluster,msvbhat/planet-gluster