qa_tests/classical: more readable output in case of failure
qa_tests/classical: more readable output in case of failure


Former-commit-id: 8aca92ccdc8b40d2ea92f3e33b808ae40022cc9c [formerly 39593a99ac045f9b0349805e326c8b8375e59572]
Former-commit-id: 19ff5459b3bcc88b1edaae955ac147e339e58f1a
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine