zed: post a udev change event from spa_vdev_attach()

In order for zed to process the removal event correctly,
udev change event needs to be posted to sync the blkid
information. spa_create() and spa_config_update() posts
the event already through spa_write_cachefile(). Doing
the same for spa_vdev_attach() that handles the case
for vdev attachment and replacement.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Richard Yao <[email protected]>
Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Signed-off-by: Ameer Hamza <[email protected]>
Closes openzfs#14172

module/zfs/spa_misc.c

@@ -1290,7 +1290,7 @@ spa_vdev_config_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error,
 	 * If the config changed, update the config cache.
 	 */
 	if (config_changed)
-		spa_write_cachefile(spa, B_FALSE, B_TRUE, B_FALSE);
+		spa_write_cachefile(spa, B_FALSE, B_TRUE, B_TRUE);
 }
 
 /*