Expose UDP port in UDP ingress example

[chotiwat]

The port protocol in the nginx UDP loadbalancing example is not specified so it defaults to TCP.

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[k8s-reviewable]

This change is 

[chotiwat]

Signed the CLA.

[coveralls]

Coverage remained the same at 43.578% when pulling da01583 on chotiwat:patch-1 into 923f4d4 on kubernetes:master.

[coveralls]

Coverage remained the same at 43.578% when pulling da01583 on chotiwat:patch-1 into 923f4d4 on kubernetes:master.

[chotiwat]

My bad, that was just a registration. It's signed now.

[aledbf]

/lgtm

[aledbf]

@chotiwat thanks!