Fix default_volume_type for Cinder multi backend

The default_volume_type option doesn't support comma separated
arguments. We can only select one default volume type.
We have a variable that contains the default volume type, so we simply use it.

Closes-Bug: 1342569

Change-Id: Ibd080442f00f3d446ec374fc5906f0778d449007
Signed-off-by: Sébastien Han <sebastien.han@enovance.com>

lib/cinder

@@ -246,13 +246,13 @@ function configure_cinder {
                 configure_cinder_backend_${BE_TYPE} ${BE_NAME}
             fi
             if [[ -z "$default_type" ]]; then
-                default_type=$BE_TYPE}
+                default_type=$BE_TYPE
             fi
             enabled_backends+=$BE_NAME,
         done
         iniset $CINDER_CONF DEFAULT enabled_backends ${enabled_backends%,*}
         if [[ -n "$default_type" ]]; then
-            iniset $CINDER_CONF DEFAULT default_volume_type ${enabled_backends%,*}
+            iniset $CINDER_CONF DEFAULT default_volume_type ${default_type}
         fi
     fi