* Fix docker builds of notebook and tensorboard controller
* The notebook-controllers and tensorboard-controllers now depend on
the go package components/common
* We need to rewrite the Dockerfiles so that the context is now
${KUBEfLOW_REPO}/common
* so that components/common can be included in the context and copied
to the Dockerfile
* Create skaffold configs to make it easier to do remote builds with Kaniko
* The skaffold configs are currently written assuming the kubeflow-ci cluster
is used to build the images. This could be generalized in the future.
* Remove the code to build the notebook-controller with GCB; we can just
use skaffold and kaniko to do efficient remote builds.
* Related to #4582 - Jupyter image doesn't build.
* Fix docker build rule.
Jeremy Lewi