rbd: Do not error out on a single image during pool refresh
rbd: Do not error out on a single image during pool refresh

It could happen that rbd_list() returns X names, but that while
refreshing the pool one of those RBD images is removed from Ceph
through a different route then libvirt.

We do not need to error out in such case, we can simply ignore the
volume and continue.

  error : volStorageBackendRBDRefreshVolInfo:289 :
    failed to open the RBD image 'vol-998': No such file or directory

It could also be that one or more Placement Groups (PGs) inside Ceph
are inactive due to a system failure.

If that happens it could be that some RBD images can not be refreshed
and a timeout will be raised by librados.

  error : volStorageBackendRBDRefreshVolInfo:289 :
    failed to open the RBD image 'vol-893': Connection timed out

Ignore the error and continue to refresh the rest of the pool's
contents.

Signed-off-by: Wido den Hollander <be4891756a4fdc8c3c6609eb41e49789e971fe07@widodh.nl>

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