missing import of util function
missing import of util function


Former-commit-id: 0b0228cfa23344fd85fedaa636be8326b4468cb3 [formerly e24e6701d42814fd0f3664c6dedddd5682329f90]
Former-commit-id: d1bbdb9d18c6a172305757d0e2a3afafd6dd8d3f
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine