Add skeleton integration test

In this first step, we add an empty integration test that does nothing
but list `Pipeline`s in a namespace harded coded to `arendelle`
(already used the Toy Story theme in knative/serving, needed something
different here, thanks @aaron-prindle XD).

This can be run manually against a developer's own cluster, so folks can
start adding integration tests in parallel if they want to.

This is based off the end to end tests in knative/serving
(https://github.com/knative/serving/tree/master/test#running-end-to-end-tests)
and uses the libs in knative/pkg extensively, which were made from the
libs in knative/serving. The docs weren't moved with the libs tho which
I'm trying to fix in:
* knative/serving#2097
* knative/pkg#102

The commit adds opencensus, since this is used by the test libs for
collecting and emitting metrics. We might want to use those eventually
too so that seems fine tho it would be nice if they were optional
¯\_(ツ)_/¯

This is the first step for #16, next I'll be looking into executing these
via Prow, either against a hardcoded cluster with the secrets in Prow or
going straight for kubetest + boskos.

DEVELOPMENT.md

@@ -74,7 +74,7 @@ for your `KO_DOCKER_REPO` if required. To be able to push images to `gcr.io/<pro
 gcloud auth configure-docker
 ```
 
-4. The user you are using to interact with your k8s cluster must be a cluster admin to create role bindings:
+The user you are using to interact with your k8s cluster must be a cluster admin to create role bindings:
 
 ```shell
 # Using gcloud to get your current user
@@ -94,6 +94,7 @@ While iterating on the project, you may need to:
 1. Update your (external) dependencies with: `./hack/update-deps.sh`.
 1. Update your type definitions with: `./hack/update-codegen.sh`.
 1. [Add new CRD types](#adding-new-types)
+1. [Add and run tests](./test/README.md#tests)
 
 To make changes to these CRDs, you will probably interact with: