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Make auth-server part of the infrastructure layer

Closes #74

See merge request !191

Replaces the dedicated auth-server service: auth-server is a
low-level, configurable service just one level above PAM and such, so
it makes sense to just run it everywhere and have roles configure it
on demand. Having it as a service also makes dependencies harder to
manage.

Fixes issue #74.

Generate TSIG keys directly in Python

See merge request !190

Removes the need for the problematic bind9 dependency.

Make the host field support the 'All' value.

Make important / high-volume services bypass conntrack

See merge request !189

This should allow the creation of an inhibit rule between prober jobs
and the probe-specific Prometheus jobs.

Fixes issue #99.

Use the new version of the admin dashboard

See merge request !187

Refactor blackbox prober configuration

Closes #101

See merge request !181

The ansible 'fetch' module gets angry if a file's size changes during
transfer, which it will do because rsyslog keeps writing to it.