interface: allow multiple IPv4 addresses in interface XML
interface: allow multiple IPv4 addresses in interface XML

An upcoming netcf release will support multiple ipv4 addresses, so
let's loosen up libvirt's interface.rng to allow it.

rlaager/libvirt,nertpinx/libvirt,olafhering/libvirt,andreabolognani/libvirt,rlaager/libvirt,andreabolognani/libvirt,rlaager/libvirt,datto/libvirt,fabianfreyer/libvirt,crobinso/libvirt,jardasgit/libvirt,agx/libvirt,libvirt/libvirt,zippy2/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,taget/libvirt,jardasgit/libvirt,eskultety/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jfehlig/libvirt,eskultety/libvirt,VenkatDatta/libvirt,agx/libvirt,andreabolognani/libvirt,nertpinx/libvirt,rlaager/libvirt,jfehlig/libvirt,datto/libvirt,zippy2/libvirt,zippy2/libvirt,taget/libvirt,agx/libvirt,eskultety/libvirt,libvirt/libvirt,eskultety/libvirt,taget/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,zippy2/libvirt,olafhering/libvirt,rlaager/libvirt,jardasgit/libvirt,libvirt/libvirt,olafhering/libvirt,agx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,crobinso/libvirt,andreabolognani/libvirt,taget/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,jfehlig/libvirt,olafhering/libvirt,datto/libvirt,VenkatDatta/libvirt,datto/libvirt,taget/libvirt,fabianfreyer/libvirt,datto/libvirt,agx/libvirt,crobinso/libvirt,eskultety/libvirt,jardasgit/libvirt,crobinso/libvirt