In our kube-dns manifest for 1.6 we often had an empty section,
normalization converted this to `{}` which causes `kubectl apply` to
fail.
We can simply skip empty objects when outputing.
We don't call klog.InitFlags yet, because that will cause a flag
redefinition error until we get everyone to stop using glog. That
will happen when we update to k8s 1.13.
When try `make govet` on `go1.11beta1`. It complains many things
related to invalid string formatting:
```
pkg/kubemanifest/visitor.go:35: Verbose.Infof format %s has arg v of wrong type bool
pkg/kubemanifest/visitor.go:40: Verbose.Infof format %s has arg v of wrong type float64
upup/pkg/fi/cloudup/alitasks/disk.go:76: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/cloudup/alitasks/disk.go:91: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/cloudup/alitasks/launchconfiguration.go:89: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/cloudup/alitasks/loadbalancer.go:71: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/cloudup/alitasks/loadbalancer.go:125: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/cloudup/alitasks/scalinggroup.go:71: Verbose.Info call has possible formatting directive %q
dns-controller/pkg/dns/dnscontroller.go:603: Verbose.Infof format %s has arg records of wrong type []dns.Record
dns-controller/cmd/dns-controller/main.go:184: Verbose.Info call has possible formatting directive %q
pkg/acls/s3/storage.go:62: Verbose.Infof format %q arg u.String is a func value, not called
pkg/apis/kops/validation/validation_test.go:199: T.Fatalf format %q has arg config of wrong type *k8s.io/kops/pkg/apis/kops.DockerConfig
pkg/resources/aws/aws.go:1306: Warning call has possible formatting directive %q
pkg/resources/aws/aws.go:1313: Warning call has possible formatting directive %v
upup/pkg/fi/cloudup/aliup/ali_cloud.go:218: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/cloudup/aliup/ali_cloud.go:290: Verbose.Info call has possible formatting directive %q
upup/pkg/fi/fitasks/keypair.go:266: Errorf format %q has arg e.Name of wrong type *string
upup/pkg/fi/files_owner.go:56: Infof format %s has arg group of wrong type *fi.Group
upup/pkg/fi/users.go:57: Warning call has possible formatting directive %q
upup/pkg/fi/users.go:63: Warning call has possible formatting directive %q
upup/pkg/fi/users.go:68: Warning call has possible formatting directive %q
upup/pkg/fi/users.go:129: Warning call has possible formatting directive %q
upup/pkg/fi/users.go:135: Warning call has possible formatting directive %q
upup/pkg/fi/nodeup/nodetasks/file.go:313: Errorf format %q has arg e.Mode of wrong type *string
upup/pkg/fi/cloudup/awsup/aws_cloud.go:1021: Warningf format %q reads arg #2, but call has 1 arg
upup/pkg/fi/cloudup/awsup/aws_cloud.go:1025: Warningf format %q reads arg #2, but call has 1 arg
```
Justin SB