[python stack] Port mismatch

[kadel]

Which area this feature is related to?

/kind bug

Which area this bug is related to?

/area registry

Bug Summary

In python 3.0.0 stack devfile.yaml has

      endpoints:
        - name: http-python
          targetPort: 8080

that matches what is there in starterProject

but [kubernetes component] (https://github.com/devfile/registry/blob/4e7b4782b2a49874cc73ff6537544f71288d2874/stacks/python/3.0.0/devfile.yaml#L52) and related stuff uses 8081

  - name: deploy
    kubernetes:
      uri: kubernetes/deploy.yaml
      endpoints:
      - name: http-8081
        targetPort: 8081

Devfiles uses 8081, deploy.yaml has also 8081

[thepetk]

blocked by #1367

[michael-valdron]

blocked by #1415