add a recovery flag to proto to indicates communications from orphan eva...

This is for Driver HA. Add recovery flag in proto for marking communications coming from orphan evaluators started by previous driver (that crashed). This allows re-establishing communications between those evaluators and the reincarnated driver. 

Evaluator side change is currently done on the .NET side only.
This is for the first heartbeat, the first heartbeat is first used to trigger instantication of EvaluatorManger (and put to Evaluators list), then immedidately used in onEvaluatorHeartbeatMessage to populates its states (to running). See changes on line 56-64 in EvaluatorHeartbeatHandler.