filer: make k8s service ClusterIP type

easier to patch/expose ( probably LoadBalancer will be better, but that also works)

k8s/seaweedfs/templates/filer-service-client.yaml

@@ -10,7 +10,6 @@ metadata:
     monitoring: "true"
 {{- end }}
 spec:
-  clusterIP: None
   ports:
   - name: "swfs-filer"
     port: {{ .Values.filer.port }}
@@ -28,4 +27,4 @@ spec:
 {{- end }}
   selector:
     app: {{ template "seaweedfs.name" . }}
-    component: filer
+    component: filer