When adding a new shard to a cluster, the configsvr should push the clusterParameters onto the newly added shard. This should be done during the _configsvrAddShard procedure, before the new shard has become a member of the cluster.

This ticket should also ensure that SetClusterParameterCoordinator serializes with add/remove shard when propagating new parameter values to the shards. This is needed to avoid situations where due to a concurrently added shard, SetClusterParameterCoordinator would miss propagating the new parameter to that new shard.