containers: Fix unit-tests documentation
containers: Fix unit-tests documentation

Commit 6ebc7ef28 changed the path of the invoked run.sh, adjust README
accordingly.

deryni/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,martinpitt/cockpit,cockpituous/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,cockpituous/cockpit,cockpituous/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,deryni/cockpit,martinpitt/cockpit,cockpit-project/cockpit,mareklibra/cockpit,mvollmer/cockpit,garrett/cockpit,andreasn/cockpit,garrett/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,cockpituous/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,andreasn/cockpit,cockpit-project/cockpit,mareklibra/cockpit,andreasn/cockpit,andreasn/cockpit,cockpituous/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,andreasn/cockpit,andreasn/cockpit,mareklibra/cockpit,andreasn/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit