Add `volumenameprefix` storageclass parameter in GlusterFS

dynamic PV provisioning example section.

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

staging/persistent-volume-provisioning/README.md

@@ -101,7 +101,7 @@ For a complete example refer ([Portworx Volume docs](../volumes/portworx/README.
 apiVersion: storage.k8s.io/v1
 kind: StorageClass
 metadata:
-  name: slow
+  name: fast
 provisioner: kubernetes.io/glusterfs
 parameters:
   resturl: "http://127.0.0.1:8081"
@@ -151,6 +151,12 @@ For available volume types and its administration options refer: ([Administratio
 
 For available volume options and its administration refer: ([Administration Guide](https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.2/html/administration_guide/chap-managing_red_hat_storage_volumes))
 
+* `volumenameprefix` : By default dynamically provisioned volumes has the naming schema of `vol_UUID` format. With this option present in storageclass, an admin can now prefix the desired volume name from storageclass. If `volumenameprefix` storageclass parameter is set, the dynamically provisioned volumes are created in below format where `_` is the field seperator/delimiter:
+
+`customvolumeprefix_PVCname_randomUUID`
+
+Please note that, the value for this parameter cannot contain `_` in storageclass. This is an optional parameter.
+
 Reference : ([How to configure Gluster on Kubernetes](https://github.com/gluster/gluster-kubernetes/blob/master/docs/setup-guide.md))
 
 Reference : ([How to configure Heketi](https://github.com/heketi/heketi/wiki/Setting-up-the-topology))

staging/persistent-volume-provisioning/glusterfs/glusterfs-storageclass.yaml

@@ -13,3 +13,4 @@ parameters:
   gidMax: "50000"
   volumetype: "replicate:3"
   volumeoptions: "client.ssl on, server.ssl on"
+  volumenameprefix: "dept-dev"