Make RpcException errors more informative

src/csharp/Grpc.Core/RpcException.cs

@@ -42,7 +42,7 @@ namespace Grpc.Core
     {
         private readonly Status status;
 
-        public RpcException(Status status)
+        public RpcException(Status status) : base(status.ToString())
         {
             this.status = status;
         }

src/csharp/Grpc.Core/Status.cs

@@ -69,5 +69,12 @@ namespace Grpc.Core
                 return detail;
             }
         }
+
+        public override string ToString()
+        {
+            return string.Format("Status(StatusCode={0}, Detail=\"{1}\")", statusCode, detail);
+        }
+
+
     }
 }