tests/supervisor: silence all the log messages coming from tests
tests/supervisor: silence all the log messages coming from tests


Former-commit-id: db6932936657fcb0a6e20d4335cf9e58484a9b8d [formerly db6932936657fcb0a6e20d4335cf9e58484a9b8d [formerly 142cad1c44e9121d8fb760e8647f585d9dfbfc4f]]
Former-commit-id: be000ee88780d976e27052d6f512db2e7f854554
Former-commit-id: f11ba82e44d447cfca3ab4fc23d90518153731ba
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine