fluent-bit: Rename Fluent Bit plugin output name. (grafana#2974)

This prevents a clash with the Loki plugin now included with
the Fluent Bit agent by default.

The output plugin is now named `grafana-loki`.

Signed-off-by: Heds Simons <heds@whaleway.net>
(cherry picked from commit 4e2b3ec)

production/helm/fluent-bit/templates/configmap.yaml

@@ -33,7 +33,7 @@ data:
         K8S-Logging.Exclude {{ .Values.config.k8sLoggingExclude }}
         K8S-Logging.Parser {{ .Values.config.k8sLoggingParser }}
     [Output]
-        Name loki
+        Name grafana-loki
         Match *
         {{- if and .Values.loki.user .Values.loki.password }}
         Url {{ .Values.loki.serviceScheme }}://{{ .Values.loki.user }}:{{ .Values.loki.password }}@{{ include "loki.serviceName" . }}:{{ .Values.loki.servicePort }}{{ .Values.loki.servicePath }}