Use std::this_thread::sleep_for instead of #ifdef and usleep
Use std::this_thread::sleep_for instead of #ifdef and usleep

Change-Id: I3a935d9ba233704e3ec4e8f6f635af8e38deab94
Reviewed-on: http://review.couchbase.org/91086
Reviewed-by: Daniel Owen <b3fc0e1a51f252986e60be7da121b74d3ac6845f@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine