Use self.reopen_conn() instead of rolling our own.
Confirm WT_CURSOR.next_random works for both in-memory and on-disk
formats.
Change WT_CURSOR.next-random to handle insert lists where the updates
aren't visible to the running thread; admittedly an edge case, but it
seems best if cursor calls don't return references to updates that may
subsequently disappear.

This change should close issue #1064.
update a comment.