e2e test cases should clean up more effectively

Graceful deletion exposes weakness in cleanup paths, add
common hooks for waiting for namespcae deletion to complete,
use direct delection where necessary, and add some debug output
for finding cleanup flags (namespaces that aren't fully deleted)

test/e2e/framework.go

@@ -94,7 +94,8 @@ func (f *Framework) afterEach() {
 	}
 
 	By(fmt.Sprintf("Destroying namespace %q for this suite.", f.Namespace.Name))
-	if err := f.Client.Namespaces().Delete(f.Namespace.Name); err != nil {
+
+	if err := deleteNS(f.Client, f.Namespace.Name); err != nil {
 		Failf("Couldn't delete ns %q: %s", f.Namespace.Name, err)
 	}
 	// Paranoia-- prevent reuse!