Add test for immutable client IP bug

[jbarrick-mesosphere]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind bug

What this PR does / why we need it:

Reproduce a bug in KUDO:

2019/06/28 01:49:40 Going to apply patch
{"metadata": {"annotations": {}}, "spec": {"clusterIP":null,"ports":[{"name":"gossip","port":80,"targetPort":0}],"sessionAffinity":null}}

 to object
&Service{ObjectMeta:k8s_io_apimachinery_pkg_apis_meta_v1.ObjectMeta{Name:my-instance-svc,GenerateName:,Namespace:kudo-test-adapting-parakeet,SelfLink:/api/v1/namespaces/kudo-test-adapting-parakeet/services/my-instance-svc,UID:fded0ced-9946-11e9-9081-0242ac110002,ResourceVersion:98,Generation:0,CreationTimestamp:2019-06-28 01:49:39 +0000 UTC,DeletionTimestamp:<nil>,DeletionGracePeriodSeconds:nil,Labels:map[string]string{app: ,heritage: kudo,instance: my-instance,version: 1.0,},Annotations:map[string]string{phase: deploy,plan: deploy,planexecution: my-instance-deploy-573106463,step: deploy,},OwnerReferences:[{kudo.k8s.io/v1alpha1 Instance my-instance fdc1eaaf-9946-11e9-9081-0242ac110002 0xc000bf675c 0xc000bf675d}],Finalizers:[],ClusterName:,Initializers:nil,ManagedFields:[],},Spec:ServiceSpec{Ports:[{gossip TCP 80 {0 80 } 0}],Selector:map[string]string{app: ,heritage: kudo,instance: my-instance,label: test,version: 1.0,},ClusterIP:10.0.0.198,Type:ClusterIP,ExternalIPs:[],SessionAffinity:None,LoadBalancerIP:,LoadBalancerSourceRanges:[],ExternalName:,ExternalTrafficPolicy:,HealthCheckNodePort:0,PublishNotReadyAddresses:false,SessionAffinityConfig:nil,},Status:ServiceStatus{LoadBalancer:LoadBalancerStatus{Ingress:[],},},}
2019/06/28 01:49:40 PlanExecutionController: CreateOrUpdate Patch: Service "my-instance-svc" is invalid: spec.clusterIP: Invalid value: "": field is immutable

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?: