use ordereddict to ensure sites ordering
use ordereddict to ensure sites ordering


Former-commit-id: 3415caa7bd2b544e7287033aad9707bec985599c [formerly f3c7bc1574c7337926fb0a5e9585908fe5a9230b]
Former-commit-id: 33fbd19465cbec11d4ba16129a64f7c9b0abaac2
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine