At runtime, systemd_services includes docker-* services too.

base: create dataset restore unit

See merge request !85

base: cleanup failed and disabled units

See merge request !86

Failed units will stick around even when the underlying service file has
been removed.

Unroll inner Docker loop

See merge request !84

Use it as a dependency for service units to restore data before startup.

This is useful for diff scenarios until we fix the issue where
the credentials role doesn't work with --check, so at least
this phase can be skipped safely without affecting the rest of
the rollout.

This should make Ansible happier by parallelizing tasks without
using the 'include_tasks' directive. The results are a little
less readable.

Match what the tests expect and services.yml.no-elasticsearch

Introduce dataset owner

See merge request !83

prometheus: use thanos as default datasource

See merge request !82

Deploy thanos sidecar and query alongside Prometheus. Queries ran
through thanos query will ask all sidecars for queries and fill in the
gaps for missing data and deduplicate as needed.

prometheus: use node_exporter 0.16 metric names

See merge request !81

prometheus: add standard host label to external targets

See merge request !80

Streamline credential generation with single-level Ansible loops

See merge request !67