rpm: install oq-engine in opt
rpm: install oq-engine in opt

Former-commit-id: 1c93ecc4d936a9f77ba372693ac237d819898494 [formerly 1c93ecc4d936a9f77ba372693ac237d819898494 [formerly bcce28cc71150ff32804c0c21379d8804b52ac45]]
Former-commit-id: ec0c6cd5962e0324b52424169c8ff2e364dc555c
Former-commit-id: e739c3f66bd90a6a75996d8b2342362d4656d259
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine