renamed 'USER' variable with 'engine_user' (avoiding to hide already system defined var
renamed 'USER' variable with 'engine_user' (avoiding to hide already system defined var


Former-commit-id: 1d602f3cc94e603990062b694f695a7b6fd647df [formerly 9bc5c7afc9d31e0bf2e58a3349a40cc3752a9063]
Former-commit-id: b1fbacb595791aeee3bebd5f0c93aa7d7dc21bb2
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine