Reduce BDD test running time by only starting CouchDB as needed

[DRK3]

The make bdd-test script builds the docker image and then runs the BDD tests run two times - once with VCS using MongoDB and once with VCS using CouchDB. However, CouchDB runs in both cases, even though it's only needed in the second. We should see if we can only run CouchDB for the second case so the tests can run a bit faster.