update engine tests to the new api of BaseCalculator
update engine tests to the new api of BaseCalculator


Former-commit-id: c0b038f1463514251d9817e4a8cafe501bf91a93 [formerly 95c2f27e88deb570c3e96963eb1d967fc4a362f7]
Former-commit-id: 269ef5ba538e5ccb77969fa6ce9679c8915ca72c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine