Revert "Update prow to v20200212-1f7b8ac1d"

[chizhg]

Boskos is broken after this update:

chizhg@chizhg-macbookpro:~/go/src/github.com/knative-prow-robot$ ku logs boskos-85f49fd654-9dxjb -n test-pods
E0217 23:44:28.890959       1 reflector.go:125] external/io_k8s_client_go/tools/cache/reflector.go:98: Failed to list *crds.DRLCObject: no kind "DRLCCollection" is registered for version "boskos.k8s.io/v1" in scheme "pkg/runtime/scheme.go:101"
E0217 23:44:28.896037       1 reflector.go:125] external/io_k8s_client_go/tools/cache/reflector.go:98: Failed to list *crds.ResourceObject: no kind "ResourceCollection" is registered for version "boskos.k8s.io/v1" in scheme "pkg/runtime/scheme.go:101"

/cc @chaodaiG

[knative-prow-robot]

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[chaodaiG]

/lgtm

…

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