Fix restart issue with rocks engine

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
rocksdb - string, not Slice
SERVER-15527 add more execution stats to explain
SERVER-15662 temporarily disable HBReconfigDuringReconfigFails
SERVER-15535 When using replSetFreeze to end a stepDown period, make sure single node replsets become PRIMARY again
SERVER-15535 Clear sharding state on stepdown
SERVER-15535 Rename sharding_state_after_reconfig.js to sharding_state_after_stepdown.js
SERVER-15535 Ensure that a node in a single node replica set will become PRIMARY when its stepdown period ends
SERVER-15527 OpCtx no longer needs to be passed into explainStages
SERVER-15528 Refactor DistinctScan to do less in each work() call
SERVER-15198: Make scramIterationCount user configurable
SERVER-15402 Improve ShardPtr/ConnectionString management for commands and setVersion

Make Shard almost logically immutable. The only non-const method remaining is reset(), which will eventually be removed.
SERVER-15535 refactor jstests/replsets/rollback_auth.js to no longer use replSetBlind
SERVER-15535 remove last vestiges of replSetBlind
SERVER-15638 Wake up SyncSourceFeedback thread when we find a new sync source
SERVER-15535 Break cancel deadlock in ReplicationExecutor.
SERVER-15535 Unit test for single node replica sets becoming PRIMARY when stepdown period ends
SERVER-15523 cleanup initial connection in Config::reloadSettings
SERVER-15591  enforce secondaryThrottle during moveChunk commit
SERVER-15677 temporarily disable to test to allow ASAN builder to make some progress