Update documentation with e2e testing instructions for kind (#722)
Update documentation with e2e testing instructions for kind (#722)

* Document how to run e2e tests for contour, both locally with kind and via `go test`

Signed-off-by: Evan Anderson <117bc6d2b27bb69c2d939d4326f66adf27abab12@gmail.com>

* Update based on dave and carlisia comments.

Signed-off-by: Evan Anderson <117bc6d2b27bb69c2d939d4326f66adf27abab12@gmail.com>
knative-sandbox/net-contour,knative-sandbox/net-contour