conf(grep): Rename PVC to be unique

Can't change these once defined (immutable). Create a new name to allow
the removal of NFS.

Author: ssoriche

apps/grep/base/deployment.yaml

@@ -67,4 +67,4 @@ spec:
       volumes:
         - name: gitrepo
           persistentVolumeClaim:
-            claimName: gitrepo
+            claimName: gitrepo-pv

apps/grep/base/pvc.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
-  name: gitrepo
+  name: gitrepo-pv
 spec:
   accessModes:
     - ReadWriteOnce