Change makefile to test for presence of cloudcafe (ignore me for now)

Just check for cloudcafe being installed, rather than whether the dev config is installed, since we don't run the tests on jenkins yet.

Can be reviewed and merged now - this just disables the tests on Jenkins and also changes the make command to not give test_repo missing errors.

Can also wait until we set up a preprod node and then this PR can attempt to run the tests against it.

Edit: waiting on this PR, because the otter-pr-cloudcafe job is running against the mock server.  This PR would turn all those off.