Helm chart service doesn't work with pod from StatefulSet

[Nikita Solosnuk]

Currently helm chart service has selectors by app and role:

selector:
    app: {{ template "fullname" . }}
    role: {{ .Values.selector.role }}

But StatefulSet template sets only role label:

template:
    metadata:
      labels:
        role: {{ .Values.selector.role }}

As result created service can't attach to the pod