* Pin pkg to release-0.18 version
* ./hack/update-deps.sh --upgrade && ./hack/update-codegen.sh
* bump k8s version to 1.18.8
* Fix the brokerage of importing latest serving
* exclude script/test-infra md from md check
* Update serving to 0.8. Try building.
* Find the right serving version
* Change our own import path to knative.dev to match
* Remove dependency on old version of client
* Update yaml template
* Add sleep to test to deal with race
* fix merge conflict
* Update vendor modules