Test flake: ignore dig failure; wait until timeout

The intent of this test was to continue trying until the timeout has
been reached. The extra assertion makes the test fail early when it
should not.

test/e2e/dns_configmap.go

@@ -200,10 +200,8 @@ func (t *dnsConfigMapTest) runDig(dnsName string) []string {
 		CaptureStderr: true,
 	})
 
-	Expect(err).NotTo(HaveOccurred())
-
-	framework.Logf("Running dig: %v, stdout: %q, stderr: %q",
-		cmd, stdout, stderr)
+	framework.Logf("Running dig: %v, stdout: %q, stderr: %q, err: %v",
+		cmd, stdout, stderr, err)
 
 	if stdout == "" {
 		return []string{}