storage: Switch metadata crawler to use storage driver to get unique path
storage: Switch metadata crawler to use storage driver to get unique path

Use the virStorageFileGetUniqueIdentifier() function to get a unique
identifier regardless of the target storage type instead of relying on
canonicalize_path().

A new function that checks whether we support a given image is
introduced to avoid errors for unimplemented backends.

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