Review where we're passing WT_CONNECTION_IMPL instead of WT_SESSION_IMPL,
and for that reason directly accessing WT_CONNECTION_IMPL.default_session,
prefer passing the session handle instead of the connection handle where
that makes sense.
Merge branch 'develop' into connection-vs-session-cleanup
Merge branch 'develop' into connection-vs-session-cleanup
Set compacting if we don't have a chunk to flush. #1225
Ensure the wtperf threads don't start in lock-step, run each thread's
RNG state 1,000 steps beyond the last thread's state, before starting
the threads.
Merge branch 'develop' into connection-vs-session-cleanup
Merge pull request #1219 from wiredtiger/connection-vs-session-cleanup

Review where we're passing WT_CONNECTION_IMPL instead of WT_SESSION_IMPL