prefer http (80 and 8080) ports when choosing the container port

Author: paulll

lib/docker.js

@@ -144,7 +144,12 @@ function isMatchingImageName(targetName, imageName) {
 
 function containerPort(dolphin, containerId) {
   return dolphin.containers.inspect(containerId).then(function (container) {
-    var port = Object.keys(container.NetworkSettings.Ports)[0].split('/')[0];
+    var portPriority = ['8080', '80']; // 80, then 8080, then others
+    var port = Object.keys(container.NetworkSettings.Ports)
+        .map(function (x) { return x.split('/')[0]})
+        .sort(function(port_a, port_b) {
+          return portPriority.indexOf(port_b) - portPriority.indexOf(port_a)
+        })[0];
 
     var netNames = Object.keys(container.NetworkSettings.Networks);
     if (netNames.length === 1) {