util: storage: Make virStorageFileChainLookup more network storage aware
util: storage: Make virStorageFileChainLookup more network storage aware

Add a few checks and avoid resolving relative links on networked
storage.

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