jsonnet/main.jsonnet: Override containerfsSelector

container_fs_.* metrics doesn't have "container" label after
openshift/pull/1402 which caused regression
for dashboards using "container" label since it gives empty datapoints
for all queries using "container" label in queries containing
container_fs_.* metrices.

Inorder to fix the dashboards added containerfsSelector in
kubernetes-monitoring/kubernetes-mixin/pull/737 and overrided the containerfsSelector
default value from  container!="" to harmless id!="" in this commit.
We really don't need that selector since we dropped the container label
in OCP for container_fs_.* metrices but we need to override the
selector for the queries involving container_fs_.* to work.

jsonnet/main.jsonnet

@@ -360,6 +360,7 @@ local inCluster =
             cpuThrottlingSelector: $.values.common.mixinNamespaceSelector,
             kubeletPodLimit: 250,
             pvExcludedSelector: 'label_alerts_k8s_io_kube_persistent_volume_filling_up="disabled"',
+            containerfsSelector: 'id!=""',
           },
         },
       },