dch-webhooks: Enable test hosts in provisioner

By default, the _pyrocufflink_ Ansible inventory plugin ignores VMs
whose names begin with `test-`.  This prevents Jenkins from failing to
apply policy to machines that it should not be managing.  The host
provisioner job, though, should apply policy to those machines, so we
need to disable that filter.

dch-webhooks/ansible-job.yaml

@@ -67,6 +67,8 @@ spec:
           value: /run/secrets/host-provisioner/rabbitmq/tls.key
         - name: AMQP_EXTERNAL_CREDENTIALS
           value: '1'
+        - name: PYROCUFFLINK_EXCLUDE_TEST
+          value: 'false'
         securityContext:
           readOnlyRootFilesystem: true
         volumeMounts: