The `to_nice_yaml` helper will by default wrap any string YAML values on
the first space after column 80. This can in worst case yield invalid
YAML syntax. More details in Ansible's documentation here:
https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#formatting-data-yaml-and-json
In short, you need to explicitly provide a custom width argument of a
high number of some kind to avoid the line wrapping.
Also get rid of `--tags=update-user-password` in the
`matrix-dendrite` role, as what we had doesn't work.
We may be able to do it with some Ansible helper or something else.
For now, we'll omit this feature.
All the `matrix_s3_*` stuff happens in the `matrix-synapse` role.
If we are to have such S3 support for Dendrite, we should probably
extract it out of the `matrix-synapse` role (into a `matrix-s3` role or
`matrix-goofys`, etc.) and wire `matrix-dendrite` accordingly.
This may or may not be done in the future though. For now, I'm
cleaning things up in the `matrix-dendrite` role.
