Updating CI scripts for knative CI

[berndtj]

CI work is not complete, but scripts are getting there

• make targets in ci/Makefile work

  • make images
  • make cluster-create
  • make install-knative
  • make build-cli
  • make deploy-dispatch-server
  • etc

• updated knative dependencies (master as of a couple days ago)

• include and support internal docker repository by default

• updated readme

Signed-off-by: Berndt Jung bjung@vmware.com