Shutdown the processpool after parallel_split_filter [skip hazardlib][demos]
Shutdown the processpool after parallel_split_filter [skip hazardlib][demos]


Former-commit-id: b83f1ee61a4b06cefb0956a27dde6c5988ef29f9
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine