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WT-3144 bug fix: random cursor returns not-found when descending to an empty page #3289
…pens the connection so we have a real tree, then truncates most / all of the tree and makes sure random lookups find data / fail (respectively). That way we're testing WT_REF_DELETED, not just empty pages.
The bug being fixed is that WT_CURSOR.next_random_leaf_skip wasn't set when random descent failed and we were falling back to skipping through pages, but restructuring the code made things simpler. Turn off cursor ordering checks: if the tree is sufficiently sparse, we can end up calling WT_CURSOR.next multiple times, and failing those checks.
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