CLOUDSTACK-9839: Add XenServer 7.1 and 7.2 interoperablility (#2346)
CLOUDSTACK-9839: Add XenServer 7.1 and 7.2 interoperablility (#2346)

Adds XenServer 7.1 and 7.2 interoperablility.
Adds hypervisor to capabilities list and add guest OS mappings (copied from 7.0.0 mappings initially).
Add newly supported OSes and remove deprecated ones (XenServer)

wido/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,jcshen007/cloudstack,wido/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,DaanHoogland/cloudstack