Remove SQLAlchemy use in hazard serialization tests.
Remove SQLAlchemy use in hazard serialization tests.


Former-commit-id: b9bd6bb7c7ba24892bab65c1a7833b1e6a972606 [formerly 04059f2317ed2f6e5ac67451635a0cd039b976d0]
Former-commit-id: 045c847d378dbffee1cd763973e43cae35c674bf
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine