Automatic merge from submit-queue
Install pip in kubekins test image and install AWS cli when needed
Follow-on to https://github.com/kubernetes/test-infra/pull/66. This fixes AWS hopefully.
I haven't pushed the image yet.
cc @fejta
Also add a makefile. This will need a cherrypick onto 1.0,1.1
with edits to hack/jenkins/test-dockerized.sh to run branch-specific
test scripts.
Also had to modify hack/verify-api-reference.sh to handle volume mount
path peculiarity when doing `docker run -v` inside a container started
with `docker run -v`. See associated comment in
hack/jenkins/test-dockerized.sh