debian: add transitional packages description in control file
debian: add transitional packages description in control file

Former-commit-id: 9ab3731e59b55b08bee16d2587ad0f5d7bc8f1c7 [formerly 9ab3731e59b55b08bee16d2587ad0f5d7bc8f1c7 [formerly e10476a5b64171bb0dae78d5965db6bce583ce68]]
Former-commit-id: b7a385b59b7c01de7d73ebc7b9483841fa532c6e
Former-commit-id: 9615628919690a5a11a449cc7f28b5ce514e73fd
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine