userprops: make clearing pool & vdev userprops work the same #781
| Job | Run time |
|---|---|
| 10s | |
| 4h 8m 34s | |
| 3h 35m 46s | |
| 3h 36m 8s | |
| 3h 58m 55s | |
| 3h 15m 55s | |
| 3h 30m 4s | |
| 3h 28m 42s | |
| 2h 31m 6s | |
| 2h 24m 36s | |
| 2h 33m 55s | |
| 2h 36m 13s | |
| 4h 39m 17s | |
| 3h 42m 9s | |
| 4h 21m 4s | |
| 3h 37m 0s | |
| 18s | |
| 2d 3h 59m 52s |