add an option to include custom labels for fluentd services

[mozz-lx]

Is your feature request related to a problem? Please describe.
I our company we use a strict admission controller policy where all our delploys, sts, jobs, pods and services require a specific set of labels to allow the creation of those API objects.

I'm unable to complete the installation of sumologic-kubernetes-collection with out an option to include custom labels in this fluentd services like.

• sumologic-sumologic-fluentd-logs-headless service
• sumologic-sumologic-fluentd-events-headless service
• sumologic-sumologic-fluentd-metrics-headless service

Describe the solution you'd like
Add an option to include custom labels in the values.yaml file for those fluentd headless services.
Could something like this.

fluentd:
  events:
    service:
      labels:
        label:1
        label:2

Other option can be to include these labels from values.fluentd.podlabels:

{{- if .Values.fluentd.podLabels }}
{{ toYaml .Values.fluentd.podLabels | indent 4 }}
{{- end }}

in the fluentd services.
metrics-service-headless
logs-service-headless
events-service-headless
events-service
metrics-service
logs-service

[mozz-lx]

Added PR with my suggested fix
#1550