Implemented remote site selection [skip hazardlib][demos]
Implemented remote site selection [skip hazardlib][demos]


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Former-commit-id: 99c0ed6395b7a07444b71d5ef3e8da7b4eea4e81
Former-commit-id: ba51924d8bff12961860bf32acbf5f6429597c19
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine