http: Fix agent id creation

Unbreaks test-regress-GH-877.js

lib/http.js

@@ -1437,7 +1437,7 @@ function getAgent(options) {
     if (options.port || options.host) {
       host = options.host || 'localhost';
       port = options.port || 80;
-      id = host + port;
+      id = host + ':' + port;
       _opts.host = host;
       _opts.port = port;
     } else if (options.socketPath) {

test/simple/test-regress-GH-877.js

@@ -6,8 +6,6 @@ var N = 20;
 var responses = 0;
 var maxQueued = 0;
 
-debugger;
-
 var agent = http.getAgent('127.0.0.1', common.PORT);
 agent.maxSockets = 10;
 
@@ -23,8 +21,6 @@ server.listen(common.PORT, "127.0.0.1", function() {
       port: common.PORT,
     };
 
-    debugger;
-
     var req = http.get(options, function(res) {
       if (++responses == N) {
         server.close();