Remove config and references to kubernetes-incubator

[cblecker]

ref kubernetes/community#1922

[cblecker]

/assign @spiffxp

[nikhita]

/lgtm
/hold

[cblecker]

/hold cancel
Test are passing, and this can be merged as soon as it's approved.

[spiffxp]

/approve
/lgtm
🎉

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cblecker, spiffxp

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Needs approval from an approver in each of these files:

• config/OWNERS [cblecker,spiffxp]
• label_sync/OWNERS [cblecker,spiffxp]
• prow/OWNERS [cblecker,spiffxp]
• velodrome/OWNERS [spiffxp]

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[k8s-ci-robot]

@cblecker: Updated the following 3 configmaps:

• job-config configmap in namespace default at cluster test-infra-trusted using the following files:
  • key fejta-bot-periodics.yaml using file config/jobs/kubernetes/test-infra/fejta-bot-periodics.yaml
  • key test-infra-trusted.yaml using file config/jobs/kubernetes/test-infra/test-infra-trusted.yaml
• config configmap in namespace default at cluster test-infra-trusted using the following files:
  • key config.yaml using file config/prow/config.yaml
• plugins configmap in namespace default at cluster test-infra-trusted using the following files:
  • key plugins.yaml using file config/prow/plugins.yaml

In response to this:

ref kubernetes/community#1922

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