I had the same problem using the ESXi ISO and the ansible playbook, but all for Ubuni v.16.04. Th eonly way I could get this working was to use v14.04. Even once I Hardened the instance, installed updates, imported the o365 Minemeld config, created recommended security policies, changed passowrds (all working as expected) I logged in today and there was an advisary to upgrade to 16.04, so I took a snapshot and folowed the prompts and lo and behold, back to the same "No module named DataTime".
So, maybe not the best idea, but I'll keep this running on v.14.04
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