Fix kubernetes port name issue

Framework/KubernetesWorkflow/K8sNameUtils.cs

@@ -24,8 +24,8 @@
                 .Replace("]", "-")
                 .Replace(",", "-");
 
-            result = result.Trim('-');
             if (result.Length > maxLength) result = result.Substring(0, maxLength);
+            result = result.Trim('-');
 
             return result;
         }

Framework/Utils/RandomUtils.cs

@@ -3,16 +3,22 @@
     public static class RandomUtils
     {
         private static readonly Random random = new Random();
+        private static readonly object @lock = new object();
 
         public static T PickOneRandom<T>(this List<T> remainingItems)
+        {
+            lock (@lock)
             {
                 var i = random.Next(0, remainingItems.Count);
                 var result = remainingItems[i];
                 remainingItems.RemoveAt(i);
                 return result;
             }
+        }
 
         public static T[] Shuffled<T>(T[] items)
+        {
+            lock (@lock)
             {
                 var result = new List<T>();
                 var source = items.ToList();
@@ -23,4 +29,5 @@
                 return result.ToArray();
             }
         }
+    }
 }