[prometheus-modbus-exporter] fix deployment template

[christopherime]

What this PR does / why we need it:

Hi, I have discover that the current deployment template for the prometheus-modbus-exporter does not handle the overloading of the registry that can be found in the values.

In the values.yaml there is two references for that action:

image:
  registry: docker.io
...
configReloaderSidecar:
  enabled: true
  image:
    registry: docker.io

But the actions in the deployment template are:

     containers:
       - name: {{ include "prometheus-modbus-exporter.fullname" . }}
         image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
       ...
        - name: {{ include "prometheus-modbus-exporter.fullname" . }}-config-reloader-sidecar
          image: "{{ .Values.configReloaderSidecar.image.repository }}:{{ .Values.configReloaderSidecar.image.tag }}"

The proposed change includes the .values.image.registry in the image address.

     containers:
       - name: {{ include "prometheus-modbus-exporter.fullname" . }}
         image: "{{ .Values.image.registry }}/{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
       ...
       - name: {{ include "prometheus-modbus-exporter.fullname" . }}-config-reloader-sidecar
         image: "{{ .Values.configReloaderSidecar.image.repository }}:{{ .Values.configReloaderSidecar.image.tag }}"

This PR is to fix that and allow the user to use a different registry for the main image and the sidecar.
The chart has also been bumped from 0.1.0 to 0.1.1 to reflect the changes.

Which issue this PR fixes:

• fixes # "N/A"

Checklist:

• DCO signed
• Chart Version bumped
• Title of the PR starts with chart name (e.g. [prometheus-couchdb-exporter])

[zeritti]

Thank you, @christopherime, for your PR, LGTM.