Update Label & Selector for 'pgo show cluster'

This commit updates the label selector utilized to identify the
PostgreSQL pods within a cluster when running the
'pgo show cluster' command.  Specifically, the 'pgo-pg-database'
and 'pg-cluster' labels are now utilized to ensure only database
Pods (i.e. PostgreSQL primary and replica Pods) are displayed
when running this command.  Additionally, the 'pgo-pg-database'
label has been removed from the cluster bootstrap Job template
to prevent bootstrap Pods from appearing in the output of the
'pgo show cluster' command.

Author: andrewlecuyer

conf/postgres-operator/cluster-bootstrap-job.json

@@ -5,7 +5,6 @@
         "name": "{{.Name}}-bootstrap",
         "labels": {
             "vendor": "crunchydata",
-            "pgo-pg-database": "true",
             "pgo-backrest-job": "true",
             "pgha-bootstrap": "{{.Name}}",
             {{.DeploymentLabels}}
@@ -17,7 +16,7 @@
                 "labels": {
                     "name": "{{.Name}}",
                     "vendor": "crunchydata",
-                    "pgo-pg-database": "true",
+                    "pgha-bootstrap": "{{.Name}}",
                     {{.PodLabels}}
                 }
             },

installers/ansible/roles/pgo-operator/files/pgo-configs/cluster-bootstrap-job.json

@@ -5,7 +5,6 @@
         "name": "{{.Name}}-bootstrap",
         "labels": {
             "vendor": "crunchydata",
-            "pgo-pg-database": "true",
             "pgo-backrest-job": "true",
             "pgha-bootstrap": "{{.Name}}",
             {{.DeploymentLabels}}
@@ -17,7 +16,7 @@
                 "labels": {
                     "name": "{{.Name}}",
                     "vendor": "crunchydata",
-                    "pgo-pg-database": "true",
+                    "pgha-bootstrap": "{{.Name}}",
                     {{.PodLabels}}
                 }
             },

internal/apiserver/clusterservice/clusterimpl.go

@@ -229,7 +229,7 @@ func GetPods(clientset kubernetes.Interface, cluster *crv1.Pgcluster) ([]msgs.Sh
 	output := []msgs.ShowClusterPod{}
 
 	//get pods, but exclude backup pods and backrest repo
-	selector := config.LABEL_BACKREST_JOB + "!=true," + config.LABEL_BACKREST_RESTORE + "!=true," + config.LABEL_PGO_BACKREST_REPO + "!=true," + config.LABEL_PG_CLUSTER + "=" + cluster.Spec.Name
+	selector := fmt.Sprintf("%s=%s,%s", config.LABEL_PG_CLUSTER, cluster.GetName(), config.LABEL_PG_DATABASE)
 	log.Debugf("selector for GetPods is %s", selector)
 
 	pods, err := clientset.CoreV1().Pods(cluster.Namespace).List(metav1.ListOptions{LabelSelector: selector})