registry: gossip unify registry option passing, optimize

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

registry/gossip/proto/gossip.proto

@@ -4,16 +4,12 @@ package gossip;
 
 // Update is the message broadcast
 message Update {
-	// unique id of update
-	string id = 1;
-	// unix nano timestamp of update
-	uint64 timestamp = 2;
 	// time to live for entry
-	uint64 expires = 3;
-	// type of update; service
-	string type = 4;
-	// what action is taken; add, del, put
-	string action = 5;
+	uint64 expires = 1;
+	// type of update
+	int32 type = 2;
+	// what action is taken
+	int32 action = 3;
 	// any other associated metadata about the data
 	map<string, string> metadata = 6;
 	// the payload data;