removed unused demo_file function
removed unused demo_file function


Former-commit-id: 8cbfd78ceff7a8bfe34dbfb37fb9aa79f98fe8bb [formerly ac4eee670b2188bbf5679d02ee840e7408d8ac48]
Former-commit-id: d49c94feffb30e72aa7a01ffab08029aaf3552a0
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine