Removed python 2.7 dependency
Removed python 2.7 dependency


Former-commit-id: 55684f4cdd9350d1a5dd34979b689cb04d73f461 [formerly 676b66558f7e8238bcaa6eb86207f8ee3ec503e6]
Former-commit-id: 504411f9a3693921eb35e6787922fd37a0e8001a
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine