pipelines: piping to grep means no way to debug, ugh

pipelines: only some tags/roles are currently idempotent 'common' uses command module for setting system locale, and for some reason service module (in post_tasks) thinks prosody needs enabling every time.

pipelines: set user and dir variables

pipelines: fix copypasted path to playbook

pipelines: of course it's in a virtualenv now

pipelines: install libssl-dev for the same package

pipelines: install libffi-dev for compiling cryptography

pipelines: install build-essential too

pipelines: install python-dev for compiling things in a virtualenv

pipelines: check provisioning