SERVER-8799: handle symbol BSON type as string in v8
SERVER-9088: ensure printjson() doesn't attempt to access DB global
SERVER-9062 don't rely on drem to normalize longitude -- explicitly reject OOB values
SERVER-9027: allow dbref shard keys
SERVER-9014 Synchronize access to CmdGetNonce::_random.
SERVER-8999 Read "indexPrefix" correctly in FTSCommand::_run()
SERVER-9111 Do not try to find user documents in $CLUSTER or $SERVER pseudodatabases.
SERVER-9085 fix units in tsToSeconds calculation
SERVER-8983 Include AuthenticationFailed error code in failed MONGODB-CR authentications.
SERVER-9003 - Display replica set chaining topology in rs.status()

Include syncingTo in heartbeat response and display this info for each
replica set member in the replSetGetStatus command.