have orchestration harness search for config files in devel/clusters
CAP-408 extend aggregation explain test to cover 2.4
extend maxTimeMS in tests to avoid spurious fails on loaded test machines
CAP-408 test aggregation explain failure on mixed sharded cluster
local orchestration: start shards in predictable order
CAP-420 test with database on different shards
CAP-455 test that ensure_index helper uses createIndexes on 2.6+
CAP-455 add createIndexes test for 2.6 mongos
add additional local orchestration logging to sharded cluster start
CAP-455 test createIndexes on mixed-version sharded cluster