packager.sh: remove the rm db, upgrade manager should be smart
packager.sh: remove the rm db, upgrade manager should be smart


Former-commit-id: 07f37b6a3a99ce1187f38b5886cba604bb422828 [formerly 07f37b6a3a99ce1187f38b5886cba604bb422828 [formerly 2079080c90c17b3ddd2cb273a5fd0a61a355942e]]
Former-commit-id: b220bf69bee322d8dd76f67313b3f36f07acdc5f
Former-commit-id: 7a38706b3a82dfbe7be357e9df1fc0d9fd814f8b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine