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/templates/rsyslog-collector.conf.j2

@@ -58,7 +58,7 @@ template(name="lokiTemplate"
            constant(value="000000000")
            constant(value="\",\"") property(name="msg" format="json")
            constant(value="\"]]}")
-        }
+}
 template(name="lokiTemplateHTTP"
          type="list" ) {
            constant(value="{")
@@ -71,7 +71,7 @@ template(name="lokiTemplateHTTP"
            constant(value="000000000")
            constant(value="\",\"") property(name="$!all-json" position.from="2" format="jsonf")
            constant(value="\"]]}")
-        }
+}
 template(name="lokiTemplateJSON"
          type="list" ) {
            constant(value="{")
@@ -85,7 +85,6 @@ template(name="lokiTemplateJSON"
            property(outname="@timestamp" name="timereported" dateFormat="unixtimestamp" format="jsonf")
            constant(value="\",\"") property(name="$!all-json" position.from="2" format="jsonf")
            constant(value="\"]]}")
-        }
 }
 # Structured audit logs already contain a @timestamp field, so we
 # don't have to add our own.
@@ -116,16 +115,6 @@ template(name="outfmt" type="list" option.jsonf="on") {
                   name="app-name" format="jsonf")
          property(outname="message"
                   name="msg" format="jsonf")
-
-     }
-{
-  "@timestamp": "2018-03-01T01:00:00+00:00",
-  "host": "172.20.245.8",
-  "severity": "DEBUG",
-  "facility": "local4",
-  "syslog-tag": "app[1666]",
-  "source": "app",
-  "message": " this is my syslog message"
 }
 
 {% if enable_elasticsearch %}