Write procedures for restoring a CSRS sharded cluster

This task is to make changes necessary to mongodb servers to support restoring shards or whole sharded clusters from backups when the config servers use the CSRS (SERVER-1448) config server protocols.

The procedures to support are:

• Restoring an entire sharded cluster from a backup in place (same host names and ports)
• Restoring an entire, new sharded cluster from a backup of a different sharded cluster (different hosts/ports).
• Restoring a single shard of a sharded cluster from a backup of that shard from that cluster.