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(the message is too long to put it in comments)

With my small experience on Havana, I did run packstack multiple times with slightly modified answer file. Normally it will try to install the openstack components specified in the answer file, but the database stays untouched, virtual machines are still there and main credentials are the same as before (because they are the same in the answer file), It might also update some software which would require restarting some of the openstack services.

I assume you meant

packstack --answer-file=packstack-answer-NEW.txt

but not --gen-answer-file

Disclaimer: I may be wrong and it is better to wait for some professional to answer.