Draft: Enable Loki as a replacement for Elasticsearch when `enable_loki` is set.

Note, it is not possible to have both Loki and Elasticsearch enabled, so enable_elasticsearch must be disabled, when enable_loki is enabled.

roles/log-collector/tasks/main.yml

 ---
 
-- user:
-    name: "log-collector"
-    system: yes
-    home: "/var/log/remote"
-    groups: ["log-collector-credentials"]
-
 # Example playbook using fail and when together
 - fail:
     msg: You cannot have enable_elasticsearch and enable_loki at the same time.
@@ -19,14 +13,6 @@
 - include_tasks: loki.yml
   when: enable_loki
 
-# Setup the rsyslog-collector instance. Needs packages from
-# stretch-backports, to support modern versions of Elasticsearch.
-- name: Install rsyslog-elasticsearch package from backports
-  apt:
-    name: rsyslog-elasticsearch
-    default_release: "{{ 'stretch-backports' if float_debian_dist == 'stretch' else '' }}"
-    state: present
-
 - name: Create the rsyslog-collector logs dir
   file:
     path: "/var/log/remote"