Finish implementing supervisor infrastructure

The process hierarchy and all supervisor control commands are now
working (e.g. status, create, destroy, restart), but nodes are
not currently spawned with the desired configuration parameters so
they don't yet operate as real cluster nodes (e.g. worker, logger,
manager, proxy).

scripts/base/frameworks/supervisor/api.zeek

@@ -7,11 +7,11 @@ export {
 	type Node: record {
 		# TODO: add proper config fields
 		name: string;
+		pid: count &optional;
 	};
 
 	type Status: record {
-		# TODO: add proper status fields
-		n: count;
+		# TODO: add more status fields ?
 		nodes: table[string] of Node;
 	};