fix service spec for kube api server

[rajatchopra]

For the auto generated kube api-server service, the service spec re-uses the service port itself. The endpoint is created correctly using public port. Fix the service also because there are some plugin controllers that react to service spec itself.

Before fix:

sh-4.2# kubectl get endpoints
NAME         ENDPOINTS                                         AGE
kubernetes   172.17.0.2:8443,172.17.0.2:8053,172.17.0.2:8053   20h

sh-4.2# kubectl get services kubernetes -o json
...
...
        "spec": {
                "clusterIP": "172.30.0.1",
                "ports": [
                    {
                        "name": "https",
                        "port": 443,
                        "protocol": "TCP",
                        "targetPort": 443     ## <--- same as port, even if the endpoint really means 8443
                    },
                    {
                        "name": "dns",
                        "port": 53,
                        "protocol": "UDP",
                        "targetPort": 8053
                    },
                    {
                        "name": "dns-tcp",
                         ...

After fix:

"spec": {
                "clusterIP": "172.30.0.1",
                "ports": [
                    {
                        "name": "https",
                        "port": 443,
                        "protocol": "TCP",
                        "targetPort": 8443     # <-- fixed, now matches the endpoint object
                    },
                    {
                        "name": "dns",
                        "port": 53,
                        "protocol": "UDP",
                        "targetPort": 8053
                    },
                    {
                        "name": "dns-tcp",

``

[k8s-reviewable]

This change is 

[srampal]

This change is needed by contiv, a CNI networking plugin for Openshift in order to watch and program the correct endpoint port number for the kubernetes api server.

[jojimt]

LGTM.

[rajatchopra]

@derekwaynecarr PTAL

[rajatchopra]

@smarterclayton Review please
/cc @kubernetes/rh-networking

[smarterclayton]

Lgtm as well but want @ncdc to sign off as well

[ncdc]

/lgtm

[smarterclayton]

/approve

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

The following people have approved this PR: rajatchopra, smarterclayton

Needs approval from an approver in each of these OWNERS Files:

• pkg/master/OWNERS [smarterclayton]

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[k8s-github-robot]

Automatic merge from submit-queue