reorganized more clearly the test_csv_to_db_loader_end_to_end test
reorganized more clearly the test_csv_to_db_loader_end_to_end test


Former-commit-id: e6aeb925fed4d0c4679df4f6a0c969d8bcec54e8 [formerly fc777e0fac0a7d585b0ee9256b149547c704df94]
Former-commit-id: 82d14317be67af25e5831c4073cbf506fbeb7e12
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine