conf: separate functions to parse DHCPHostDef and DHCPRangeDef
conf: separate functions to parse DHCPHostDef and DHCPRangeDef

These two objects were previously always parsed as a part of an IpDef,
but we will now need to be able to parse them on their own for
virNetworkUpdate(). Split the parsing functions out, with no
functional changes.

emaste/libvirt,rlaager/libvirt,elmarco/libvirt,eskultety/libvirt,jeckersb/libvirt,shugaoye/libvirt,jfehlig/libvirt,elmarco/libvirt,elmarco/libvirt,jfehlig/libvirt,siboulet/libvirt-openvz,datto/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,libvirt/libvirt,trainstack/libvirt,shugaoye/libvirt,rlaager/libvirt,jardasgit/libvirt,jeckersb/libvirt,iam-TJ/libvirt,agx/libvirt,siboulet/libvirt-openvz,jardasgit/libvirt,crobinso/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,jfehlig/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,taget/libvirt,andreabolognani/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,datto/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,novel/fbsd-libvirt,novel/fbsd-libvirt,trainstack/libvirt,libvirt/libvirt,jeckersb/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,libvirt/libvirt,jeckersb/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,nertpinx/libvirt,eskultety/libvirt,emaste/libvirt,crobinso/libvirt,iam-TJ/libvirt,emaste/libvirt,VenkatDatta/libvirt,jeckersb/libvirt,rlaager/libvirt,bjzhang/libvirt,agx/libvirt,emaste/libvirt,eskultety/libvirt,eskultety/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,emaste/libvirt,trainstack/libvirt,novel/fbsd-libvirt,zippy2/libvirt,iam-TJ/libvirt,nertpinx/libvirt,iam-TJ/libvirt,olafhering/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,agx/libvirt,datto/libvirt,cbosdo/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,elmarco/libvirt,jeckersb/libvirt,trainstack/libvirt,taget/libvirt,warewolf/libvirt,cbosdo/libvirt,crobinso/libvirt,rlaager/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,emaste/libvirt,datto/libvirt,nertpinx/libvirt,warewolf/libvirt,shugaoye/libvirt,novel/fbsd-libvirt,agx/libvirt,fabianfreyer/libvirt,warewolf/libvirt,taget/libvirt,agx/libvirt,trainstack/libvirt,shugaoye/libvirt,novel/fbsd-libvirt,olafhering/libvirt,fabianfreyer/libvirt,warewolf/libvirt,eskultety/libvirt,trainstack/libvirt,nertpinx/libvirt,andreabolognani/libvirt,crobinso/libvirt,shugaoye/libvirt,libvirt/libvirt,bjzhang/libvirt,olafhering/libvirt,siboulet/libvirt-openvz,bjzhang/libvirt,siboulet/libvirt-openvz,jardasgit/libvirt,datto/libvirt,jfehlig/libvirt,zhlcindy/libvirt-1.1.4-maintain,novel/fbsd-libvirt,VenkatDatta/libvirt,warewolf/libvirt,novel/fbsd-libvirt,emaste/libvirt,warewolf/libvirt,bjzhang/libvirt,cbosdo/libvirt,zippy2/libvirt,taget/libvirt,olafhering/libvirt,trainstack/libvirt,warewolf/libvirt,taget/libvirt,cbosdo/libvirt,jeckersb/libvirt,iam-TJ/libvirt