FluentD Chart ConfigMap default values do not work

## What happened

In the FluentD chart the default values for in config map are not mapped to the ConfigMap resource that is created, when deployed, no values are placed in the config map.

## What I expect

Values from the default values file to be in ConfigMap

## What else

I noticed in the `values.yaml` file that the value is `configMap`, but the range function in the configmap template is looking for `configMaps` seen [here](https://github.com/cloudposse/charts/blob/d9bc52e1ddeadb9fdaff86e237431408b90cddee/incubator/fluentd-kubernetes/templates/configmap.yaml#L11).