Switch conductor volume claim to ReadWriteOnce

ReadWriteMany is not required for these volumes, and we required the
control plane to not provide volumes of this type, so this access mode
is causing a problem.

Jira: OSPRH-7688

pkg/ironicconductor/pvc.go

@@ -32,7 +32,7 @@ func Pvc(instance *ironicv1.IronicConductor) *corev1.PersistentVolumeClaim {
 		},
 		Spec: corev1.PersistentVolumeClaimSpec{
 			AccessModes: []corev1.PersistentVolumeAccessMode{
-				corev1.ReadWriteMany,
+				corev1.ReadWriteOnce,
 			},
 			Resources: corev1.ResourceRequirements{
 				Requests: corev1.ResourceList{