Fix the zfsd_autoreplace_001_neg test

It only ever worked by accident.

• Actually set autoreplace=off as stated in the description
• Wait for the removed device to disappear from the pool before proceeding.
• In the assertion, verify that the new disk does not get added, as described in the description.

Sponsored by: Axcient

(cherry picked from commit be092bcde96bdcfde9013d60e442cca023bfbd1b)