Fix unexpected type for object metadata when using gossip DNS

[hakman]

Before:

yaml.go:53] MetadataObj: map[creationTimestamp:<nil> labels:map[discovery.kops.k8s.io/internal-name:api.internal.test1.k8s.local] name:api-internal namespace:kube-system]:
yaml.go:58] unexpected type for object metadata: map[string]interface {}
yaml.go:63] MetadataObj: map[creationTimestamp:<nil> labels:map[discovery.kops.k8s.io/internal-name:api.internal.test1.k8s.local] name:api-internal namespace:kube-system]:
yaml.go:53] MetadataObj: map[creationTimestamp:<nil> labels:map[discovery.kops.k8s.io/internal-name:kops-controller.internal.test1.k8s.local] name:kops-controller-internal namespace:kube-system]:
yaml.go:58] unexpected type for object metadata: map[string]interface {}
yaml.go:63] MetadataObj: map[creationTimestamp:<nil> labels:map[discovery.kops.k8s.io/internal-name:kops-controller.internal.test1.k8s.local] name:kops-controller-internal namespace:kube-system]:

After:

yaml.go:53] MetadataObj: map[creationTimestamp:<nil> labels:map[discovery.kops.k8s.io/internal-name:api.internal.test1.k8s.local] name:api-internal namespace:kube-system]:
yaml.go:63] MetadataObj: map[labels:map[discovery.kops.k8s.io/internal-name:api.internal.test1.k8s.local] name:api-internal namespace:kube-system]:
yaml.go:53] MetadataObj: map[creationTimestamp:<nil> labels:map[discovery.kops.k8s.io/internal-name:kops-controller.internal.test1.k8s.local] name:kops-controller-internal namespace:kube-system]:
yaml.go:63] MetadataObj: map[labels:map[discovery.kops.k8s.io/internal-name:kops-controller.internal.test1.k8s.local] name:kops-controller-internal namespace:kube-system]:

[hakman]

/test all

[k8s-ci-robot]

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