Simplify unit test exec process
Simplify unit test exec process

Remove extra steps from `make unit` process. This step was required to
manage topology-engine tests. Now we have no TE and can get rid from
it's artifacts.

telstra/open-kilda,telstra/open-kilda,jonvestal/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda,telstra/open-kilda,jonvestal/open-kilda,jonvestal/open-kilda