QA-170: Move backend-tests files knowledte to integration repo
QA-170: Move backend-tests files knowledte to integration repo

Rely on integration repo (versioned) to decide on which docker-compose
files are required for which test suite (open/enterprise).

See commit there for implementation details.

Changlo: None

Signed-off-by: Lluis Campos <9244cb41c39addfc5cf236920b776ea2820513d0@northern.tech>

mendersoftware/meta-mender-qemu