3956 ::vdev -r should work with pipelines
3957 ztest should update the cachefile before killing itself
3958 multiple scans can lead to partial resilvering
3959 ddt entries are not always resilvered
3960 dsl_scan can skip over dedup-ed blocks if physical birth != logical birth
3961 freed gang blocks are not resilvered and can cause pool to suspend
3962 ztest should print out zfs debug buffer before exiting
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>

*** 1138,1148 ****
                  mdb_warn("failed to read vdev_t at %p\n", (uintptr_t)addr);
                  return (DCMD_ERR);
          }
  
          if (flags & DCMD_PIPE_OUT) {
!                 mdb_printf("%#lr", addr);
          } else {
                  if (vdev.vdev_path != NULL) {
                          if (mdb_readstr(desc, sizeof (desc),
                              (uintptr_t)vdev.vdev_path) == -1) {
                                  mdb_warn("failed to read vdev_path at %p\n",
--- 1138,1148 ----
                  mdb_warn("failed to read vdev_t at %p\n", (uintptr_t)addr);
                  return (DCMD_ERR);
          }
  
          if (flags & DCMD_PIPE_OUT) {
!                 mdb_printf("%#lr\n", addr);
          } else {
                  if (vdev.vdev_path != NULL) {
                          if (mdb_readstr(desc, sizeof (desc),
                              (uintptr_t)vdev.vdev_path) == -1) {
                                  mdb_warn("failed to read vdev_path at %p\n",