Add the 'storpool-template' config option

Change-Id: Ia99bdf35ad3899c16a9768baeb3f82bd147f1f51
diff --git a/config.yaml b/config.yaml
index 9c93045..09a0cde 100644
--- a/config.yaml
+++ b/config.yaml
@@ -38,3 +38,13 @@
         A common backend name can be set to multiple backends with the
         same characters so that those can be treated as a single virtual
         backend associated with a single volume type.
+  storpool-template:
+    type: string
+    default:
+    description: |
+      A StorPool template defines volume replication, placement, common
+      parent snapshot, and/or limits. The storpool_template specifies which
+      template to to use for the Cinder volume type or, if specified
+      globally, as a default value for Cinder volumes. There is no
+      default value for this option; the administrator needs to provide
+      an explicit template name.