[stable/concourse] Add "worker.podManagementPolicy" (#2983)

* [stable/concourse] Add "worker.podManagementPolicy"

* Switched workers.podManagementPolicy to default to "Parallel" which is more useful for Concourse workers.

* Removed `default "Parallel"` as this is included in the Values file, as per https://github.com/kubernetes/charts/pull/2983#discussion_r157244521

* Removed conditional that required k8s 1.7+ -- https://github.com/kubernetes/charts/pull/2983#discussion_r157244764

* removed extraneous blank line

stable/concourse/Chart.yaml

@@ -1,5 +1,5 @@
 name: concourse
-version: 0.10.2
+version: 0.10.3
 appVersion: 3.6.0
 description: Concourse is a simple and scalable CI system.
 icon: https://avatars1.githubusercontent.com/u/7809479

stable/concourse/README.md

@@ -128,6 +128,7 @@ The following tables lists the configurable parameters of the Concourse chart an
 | `worker.terminationGracePeriodSeconds` | Upper bound for graceful shutdown, including `worker.postStopDelaySeconds` | `120` |
 | `worker.fatalErrors` | Newline delimited strings which, when logged, should trigger a restart of the worker | *See [values.yaml](values.yaml)* |
 | `worker.updateStrategy` | `OnDelete` or `RollingUpdate` (requires Kubernetes >= 1.7) | `RollingUpdate` |
+| `worker.podManagementPolicy` | `OrderedReady` or `Parallel` (requires Kubernetes >= 1.7) | `Parallel` |
 | `persistence.enabled` | Enable Concourse persistence using Persistent Volume Claims | `true` |
 | `persistence.worker.class` | Concourse Worker Persistent Volume Storage Class | `generic` |
 | `persistence.worker.accessMode` | Concourse Worker Persistent Volume Access Mode | `ReadWriteOnce` |

stable/concourse/templates/worker-statefulset.yaml

@@ -163,3 +163,4 @@ spec:
   updateStrategy:
     type: {{ .Values.worker.updateStrategy }}
 {{- end }}
+  podManagementPolicy: {{ .Values.worker.podManagementPolicy }}

stable/concourse/values.yaml

@@ -461,6 +461,13 @@ worker:
   ##
   updateStrategy: RollingUpdate
 
+  ## Pod Management strategy (requires Kubernetes 1.7+)
+  ## Ref: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#pod-management-policies
+  ##
+  ## "OrderedReady" is default. "Parallel" means worker pods will launch or terminate
+  ## in parallel.
+  podManagementPolicy: Parallel
+
 ## Persistent Volume Storage configuration.
 ## ref: https://kubernetes.io/docs/user-guide/persistent-volumes
 ##