Fix add_nested_replacing_spare test case

Use 'zpool reopen' instead of 'zpool scrub' to kick in the spare device:
this is required to avoid spurious failures caused by a race condition
in events processing by the ZFS Event Daemon:

P1 (zpool scrub)                            P2 (zed)
---
zfs_ioc_pool_scan()
 -> dsl_scan()
  -> vdev_reopen()
   -> vdev_set_state(VDEV_STATE_CANT_OPEN)
                                            zfs_ioc_vdev_attach()
                                             -> spa_vdev_attach()
                                              -> dsl_resilver_restart()
  -> dsl_sync_task()
   -> dsl_scan_setup_check()
   <- dsl_scan_setup_check(): EBUSY

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: loli10K <[email protected]>
Closes #7247 
Closes #7342 

0 files changed, 0 insertions, 0 deletions