removed old comment and unused import
removed old comment and unused import


Former-commit-id: 705b8dfc2b012cf90192e625c8e90a29377d1bdc [formerly 70e83a0aa6875287e0eac05f0649fbe810b7db83] [formerly 70e83a0aa6875287e0eac05f0649fbe810b7db83 [formerly 95d311e4391e89f84d3ed40911427793baa46031]]
Former-commit-id: 9d2358330bca224bd227cc5845edf38cb5fbd340
Former-commit-id: 44a3c9a1d804d73b9a9af4808f4efc55c847a6c7
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine