fix tests stuck and failed on low core machine (kubernetes-client#89)

Author: tg123

tests/AssemblyInfo.cs

@@ -0,0 +1,4 @@
+using Xunit;
+
+[assembly: CollectionBehavior(DisableTestParallelization = true)]
+

tests/WatchTests.cs

@@ -164,7 +164,7 @@ public void DisposeWatch()
                 );
 
                 // wait at least an event
-                Thread.Sleep(TimeSpan.FromMilliseconds(500));
+                Thread.Sleep(TimeSpan.FromMilliseconds(1000));
 
                 Assert.NotEmpty(events);
                 Assert.True(watcher.Watching);
@@ -174,7 +174,7 @@ public void DisposeWatch()
                 events.Clear();
 
                 // make sure wait event called
-                Thread.Sleep(TimeSpan.FromMilliseconds(500));
+                Thread.Sleep(TimeSpan.FromMilliseconds(1000));
                 Assert.Empty(events);
                 Assert.False(watcher.Watching);
 
@@ -223,7 +223,7 @@ public void WatchAllEvents()
                 );
 
                 // wait server yields all events
-                Thread.Sleep(TimeSpan.FromMilliseconds(750));
+                Thread.Sleep(TimeSpan.FromMilliseconds(1000));
 
                 Assert.Contains(WatchEventType.Added, events);
                 Assert.Contains(WatchEventType.Deleted, events);
@@ -266,7 +266,7 @@ public void WatchServerDisconnect()
             }
 
             // wait server down
-            Thread.Sleep(TimeSpan.FromMilliseconds(500));
+            Thread.Sleep(TimeSpan.FromMilliseconds(1000));
 
             Assert.False(watcher.Watching);
             Assert.IsType<IOException>(exceptionCatched);