tests/utils/helpers: added a missing import (subprocess)
tests/utils/helpers: added a missing import (subprocess)


Former-commit-id: 4249551c795567a143168a9c4e63940a3638e4c9 [formerly d058ad0f706e62d06f222b6c6b3b945c85bba9ef]
Former-commit-id: 577b04ff99ecb26f82388e99eee86419c146e9ea
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine