Update ingress port from server to 80

[waterscar]

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Simply fix the typo(?) issue in the ingress port default value.

[sijie]

@waterscar nice catch!

[sijie]

run java8 tests

[waterscar]

Some comments after:
Even though I couldn't find any official document from kubernetes describing this, but it does support using the port name of the service in the servicePort field of ingress. And it is actually quite commonly used in helm charts.
So it was not a typo issue and original configuration does work :)