fix: fix the service monitor label selector (#215)

This patch does the following:
1. Use "cadvisor.selectorLabels" to select services in the
   ServiceMonitor
2. Make spacing consistent across templates

Signed-off-by: Oleh Neichev <oleg.neichev@gmail.com>

charts/cadvisor/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: A chart for a Cadvisor deployment
 name: cadvisor
-version: 2.4.0
+version: 2.4.1
 appVersion: 0.52.1
 home: https://github.com/google/cadvisor
 sources:

charts/cadvisor/templates/daemonset.yaml

@@ -82,4 +82,3 @@ spec:
       tolerations:
 {{ toYaml . | indent 8 }}
     {{- end }}
-

charts/cadvisor/templates/servicemonitor.yaml

@@ -9,7 +9,7 @@ metadata:
 spec:
   selector:
     matchLabels:
-      app: {{ template "cadvisor.name" . }}
+      {{- include "cadvisor.selectorLabels" . | nindent 6 }}
   namespaceSelector:
     matchNames:
       - {{ .Release.Namespace }}
@@ -27,4 +27,3 @@ spec:
         {{- toYaml .Values.metrics.metricRelabelings | nindent 8 }}
       {{- end -}}
 {{- end -}}
-