Reintroduce NOHUP handler, but skip it if running with nohup
Reintroduce NOHUP handler, but skip it if running with nohup


Former-commit-id: bfdc87b72cfb6f9cfe674babf5279ab91f5b8aa8 [formerly f43dcbae39c78fbb8b31ec7ba86a5d38ec6903a1]
Former-commit-id: 53d185c4366135271e040778c1c2cc00b9ea952c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine