test.sh: Leave dependencies of python-docker in place
test.sh: Leave dependencies of python-docker in place

'dnf remove' will, by default, try to remove packages installed only as
dependencies of the target - this resulted in python-websocket and other
packages we needed being removed, and parts of the test not running because
their absence was causing ImportErrors and test skipping.

DBuildService/atomic-reactor,projectatomic/atomic-reactor,DBuildService/atomic-reactor,fr34k8/atomic-reactor,projectatomic/atomic-reactor,fr34k8/atomic-reactor