Cancel in-progress rebuilds when we finish removal

This issue was discovered by zloop runs. When a mirror or other 
redundant top-level vdev has a disk failure, and the disk is replaced, 
the rebuild process occurs. A removal can happen while this is in 
progress. If the removal completes before the rebuild does, the 
removal process will try to free the vdev that is still in use.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #13498

module/zfs/vdev_removal.c

@@ -1364,6 +1364,8 @@ vdev_remove_complete(spa_t *spa)
 	ASSERT3P(vd->vdev_initialize_thread, ==, NULL);
 	ASSERT3P(vd->vdev_trim_thread, ==, NULL);
 	ASSERT3P(vd->vdev_autotrim_thread, ==, NULL);
+	vdev_rebuild_stop_wait(vd);
+	ASSERT3P(vd->vdev_rebuild_thread, ==, NULL);
 	uint64_t vdev_space = spa_deflate(spa) ?
 	    vd->vdev_stat.vs_dspace : vd->vdev_stat.vs_space;