Don't do a DNS lookup on every connection attempt, fix TCP disconnect detection

src/services.h

@@ -16,7 +16,7 @@
 #include "../deps/vector/vector.h"
 #include "util.h"
 
-enum State { DOWN, PARTIAL, UP };
+enum State { NONE, DOWN, PARTIAL, UP };
 struct StatusPeroid;
 struct ServerStatus;
 struct EndpointStatus;
@@ -63,6 +63,7 @@ struct Endpoint {
 	double last_ping;
 	Vector status_history;
 	pthread_t thread;
+	struct addrinfo* addr;
 	int sockfd;
 	int last_errno;
 };