libxl: support enabling the HPET
libxl: support enabling the HPET

libxl accepts hpet configuration in its domain info struct.  Parse the
domain definition's <clock> element in order to set the value.

Signed-off-by: Paolo Bonzini <69d3ebcf5ee4e7f05a50dc23cd96655b730804b4@redhat.com>

warewolf/libvirt,dumbbell/libvirt,leilihh/libvirt,fabianfreyer/libvirt,leilihh/libvirt,nertpinx/libvirt,jeckersb/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,usc-isi/libvirt,libvirt/libvirt,bjzhang/libvirt,VenkatDatta/libvirt,novel/fbsd-libvirt,olafhering/libvirt,siboulet/libvirt-openvz,fabianfreyer/libvirt,kantai/libvirt-vfork,andreabolognani/libvirt,danwent/libvirt-ovs,leilihh/libvirt,zhlcindy/libvirt-1.1.4-maintain,trainstack/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,foomango/libvirt,agx/libvirt,foomango/libvirt,warewolf/libvirt,novel/fbsd-libvirt,novel/fbsd-libvirt,eskultety/libvirt,jfehlig/libvirt,jfehlig/libvirt,rmarwaha/libvirt,foomango/libvirt,rmarwaha/libvirt,agx/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,andreabolognani/libvirt,crobinso/libvirt,olafhering/libvirt,trainstack/libvirt,jeckersb/libvirt,elmarco/libvirt,datto/libvirt,danwent/libvirt-ovs,rmarwaha/libvirt1,fabianfreyer/libvirt,taget/libvirt,siboulet/libvirt-openvz,danwent/libvirt-ovs,libvirt/libvirt,siboulet/libvirt-openvz,soulxu/libvirt-xuhj,danwent/libvirt-ovs,taget/libvirt,usc-isi/libvirt,zippy2/libvirt,leilihh/libvirt,taget/libvirt,shugaoye/libvirt,eskultety/libvirt,agx/libvirt,soulxu/libvirt-xuhj,dumbbell/libvirt,rmarwaha/libvirt1,leilihh/libvirt,crobinso/libvirt,dumbbell/libvirt,kantai/libvirt-vfork,elmarco/libvirt,agx/libvirt,wiedi/libvirt,elmarco/libvirt,siboulet/libvirt-openvz,novel/fbsd-libvirt,usc-isi/libvirt,fabianfreyer/libvirt,warewolf/libvirt,jfehlig/libvirt,rlaager/libvirt,trainstack/libvirt,jardasgit/libvirt,eskultety/libvirt,wiedi/libvirt,wiedi/libvirt,leilihh/libvirt,novel/fbsd-libvirt,novel/fbsd-libvirt,kantai/libvirt-vfork,rmarwaha/libvirt,olafhering/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt1,jardasgit/libvirt,rmarwaha/libvirt1,cbosdo/libvirt,kantai/libvirt-vfork,shugaoye/libvirt,rlaager/libvirt,zippy2/libvirt,wiedi/libvirt,rmarwaha/libvirt,taget/libvirt,VenkatDatta/libvirt,danwent/libvirt-ovs,bjzhang/libvirt,crobinso/libvirt,trainstack/libvirt,datto/libvirt,kantai/libvirt-vfork,soulxu/libvirt-xuhj,cbosdo/libvirt,soulxu/libvirt-xuhj,zhlcindy/libvirt-1.1.4-maintain,emaste/libvirt,novel/fbsd-libvirt,VenkatDatta/libvirt,iam-TJ/libvirt,warewolf/libvirt,shugaoye/libvirt,zippy2/libvirt,novel/fbsd-libvirt,jeckersb/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,rlaager/libvirt,trainstack/libvirt,emaste/libvirt,jardasgit/libvirt,jeckersb/libvirt,iam-TJ/libvirt,wiedi/libvirt,zippy2/libvirt,soulxu/libvirt-xuhj,usc-isi/libvirt,warewolf/libvirt,nertpinx/libvirt,emaste/libvirt,dumbbell/libvirt,dumbbell/libvirt,warewolf/libvirt,jfehlig/libvirt,foomango/libvirt,bjzhang/libvirt,siboulet/libvirt-openvz,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,dumbbell/libvirt,emaste/libvirt,andreabolognani/libvirt,libvirt/libvirt,iam-TJ/libvirt,nertpinx/libvirt,rmarwaha/libvirt,taget/libvirt,cbosdo/libvirt,trainstack/libvirt,trainstack/libvirt,emaste/libvirt,elmarco/libvirt,warewolf/libvirt,rmarwaha/libvirt1,emaste/libvirt,jeckersb/libvirt,jardasgit/libvirt,jeckersb/libvirt,libvirt/libvirt,jardasgit/libvirt,iam-TJ/libvirt,nertpinx/libvirt,shugaoye/libvirt,datto/libvirt,rlaager/libvirt,eskultety/libvirt,cbosdo/libvirt,eskultety/libvirt,wiedi/libvirt,jeckersb/libvirt,usc-isi/libvirt,datto/libvirt,agx/libvirt,elmarco/libvirt,foomango/libvirt,crobinso/libvirt,datto/libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,wiedi/libvirt,emaste/libvirt,rmarwaha/libvirt,rlaager/libvirt,bjzhang/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,bjzhang/libvirt