Make update_cc_config.py executable
Get rid of otter/cloudcafe

We need the dev_requirements to generate test reports in otter anyway so
there's really no need to have a separate container just for cloudcafe.
This gets rid of that.
pip install slow requirements in otter/base

As long as the versions match this will cause them to be skipped when we
later `pip install -r requirements.txt` speeding up builds by a couple
minutes