Actually mount the data volume on Prometheus nodes.
Actually mount the data volume on Prometheus nodes.

Prometheus nodes have an EBS volume attached, but wasn't being used.
This mounts it in the appropriate place.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet