E2E tests should wait for controller to be ready

[alenkacz]

This is techdebt - right now we install the controller but we don't wait for it to be ready. Because of that every test has to start with this https://github.com/vectorizedio/redpanda/blob/dev/src/go/k8s/tests/e2e/update/00-assert.yaml

We should try to use something like kubectl rollout or other kubectl commands to wait for controller to be ready and then drop all these unnecessary steps.