Remove controller-api from configserver-app
Remove controller-api from configserver-app

Note: As it were, controller-api was not mentioned in the root-level
CMakeLists.txt, and were therefore not installed.

vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa,vespa-engine/vespa