Improve version checking in charts

charts/ibm-mqadvanced-server-dev/templates/stateful-set.yaml

@@ -12,7 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+{{- if .Capabilities.APIVersions.Has "apps/v1beta2" }}
+apiVersion: apps/v1beta2
+{{- else }}
 apiVersion: apps/v1beta1
+{{- end }}
 kind: StatefulSet
 metadata:
   name: {{ template "fullname" . }}
@@ -24,7 +28,9 @@ metadata:
 spec:
   serviceName: {{ .Values.service.name }}
   replicas: 1
-  {{- if and (ge (.Capabilities.KubeVersion.Major | int) 1) (ge (.Capabilities.KubeVersion.Minor | int) 7) }}
+  {{- if and (.Capabilities.KubeVersion.Major | hasPrefix "1") (.Capabilities.KubeVersion.Minor | hasPrefix "7") }}
+  # Set updateStrategy to "RollingUpdate", if we're on Kubernetes 1.7.
+  # It's already the default for apps/v1beta2 (Kubernetes 1.8 onwards)
   updateStrategy:
     type: RollingUpdate
   {{- end }}