Fix rollingRestart reconcile for multiple same named clusters (opense…

…arch-project#836)

### Description
Fixes a bug where reconcile breaks, if there are multiple same named
OpensearchClusters in different namespaces.
The rollingRestart reconciler selects pods in all namespaces when
evaluating if the Pods are healthy and matches them with the desired
replicas. Only pods in the own namespace should be checked.

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under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and
signing off your commits, please check
[here](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).

---------

Signed-off-by: Alex Engel <[email protected]>
Signed-off-by: rkthtrifork <[email protected]>

opensearch-operator/pkg/helpers/helpers.go

@@ -247,7 +247,7 @@ func CountRunningPodsForNodePool(k8sClient k8s.K8sClient, cr *opsterv1.OpenSearc
 	selector := labels.NewSelector()
 	selector = selector.Add(*clusterReq, *componentReq)
 	// List pods matching selector
-	list, err := k8sClient.ListPods(&client.ListOptions{LabelSelector: selector})
+	list, err := k8sClient.ListPods(&client.ListOptions{Namespace: cr.Namespace, LabelSelector: selector})
 	if err != nil {
 		return 0, err
 	}
@@ -281,7 +281,7 @@ func CountPVCsForNodePool(k8sClient k8s.K8sClient, cr *opsterv1.OpenSearchCluste
 	}
 	selector := labels.NewSelector()
 	selector = selector.Add(*clusterReq, *componentReq)
-	list, err := k8sClient.ListPVCs(&client.ListOptions{LabelSelector: selector})
+	list, err := k8sClient.ListPVCs(&client.ListOptions{Namespace: cr.Namespace, LabelSelector: selector})
 	if err != nil {
 		return 0, err
 	}