Use the same name for the cluster.

Use the `cluster` prefix when naming a cluster.

Co-authored-by: Florin Irion <florin.irion@2ndquadrant.com>
Co-authored-by: Marco Nenciarini <marco.nenciarini@2ndquadrant.it>

docs/src/quickstart.md

@@ -84,7 +84,6 @@ You can verify that with:
 kubectl get deploy -n postgresql-operator-system postgresql-operator-controller-manager
 ```
 
-
 ## Part 3 - Deploy a PostgreSQL cluster
 
 As with any other deployment in Kubernetes, in order to deploy a PostgreSQL cluster
@@ -98,7 +97,7 @@ defines a simple `Cluster` with an `emptyDir` local volume:
 apiVersion: postgresql.k8s.2ndq.io/v1alpha1
 kind: Cluster
 metadata:
-  name: postgresql-emptydir
+  name: cluster-emptydir
 spec:
   instances: 3
 
@@ -151,4 +150,3 @@ You can check that the pods are being created with the `get pods` command:
 ```sh
 kubectl get pods
 ```
-

docs/src/samples/cluster-emptydir.yaml

@@ -2,7 +2,7 @@
 apiVersion: postgresql.k8s.2ndq.io/v1alpha1
 kind: Cluster
 metadata:
-  name: postgresql-emptydir
+  name: cluster-emptydir
 spec:
   instances: 3
 

tests/e2e/cluster_test.go

@@ -83,7 +83,7 @@ var _ = Describe("Cluster", func() {
 	Context("Cluster setup using emptydir", func() {
 		const namespace = "pg-emptydir-e2e"
 		const sampleFile = samplesDir + "/cluster-emptydir.yaml"
-		const clusterName = "postgresql-emptydir"
+		const clusterName = "cluster-emptydir"
 		BeforeEach(func() {
 			if err := env.CreateNamespace(namespace); err != nil {
 				Fail(fmt.Sprintf("Unable to create %v namespace", namespace))
@@ -203,7 +203,7 @@ var _ = Describe("Cluster", func() {
 	Context("Failover", func() {
 		const namespace = "failover-e2e"
 		const sampleFile = samplesDir + "/cluster-emptydir.yaml"
-		const clusterName = "postgresql-emptydir"
+		const clusterName = "cluster-emptydir"
 		var pods []string
 		var currentPrimary, targetPrimary, pausedReplica string
 		BeforeEach(func() {
@@ -363,7 +363,7 @@ var _ = Describe("Cluster", func() {
 	Context("Switchover", func() {
 		const namespace = "switchover-e2e"
 		const sampleFile = samplesDir + "/cluster-emptydir.yaml"
-		const clusterName = "postgresql-emptydir"
+		const clusterName = "cluster-emptydir"
 		var pods []string
 		var oldPrimary, targetPrimary string
 		BeforeEach(func() {