The CINDER_LVM_LO_VOLUME_SIZE var had a typo

The truncate command is failing because the CINDER_LVM_LO_VOLUME_SIZE
has a typo.

Change-Id: If5f965fab2edbb8794cf6280e350c12a863b6464
Closes-bug: #1469229

docker/common/cinder-app/cinder-volume/volume-group-create.sh

@@ -10,7 +10,7 @@ backing_file=/opt/data/cinder_volume
 check_required_vars CINDER_LVM_LO_VOLUME_SIZE CINDER_VOLUME_GROUP
 
 if ! vgs ${CINDER_VOLUME_GROUP}; then
-    [[ ! -f $backing_file ]] && truncate -s ${CINDER_LVM_LO_VOLUMES_SIZE} $backing_file
+    [[ ! -f $backing_file ]] && truncate -s ${CINDER_LVM_LO_VOLUME_SIZE} $backing_file
     vg_dev=`losetup -f --show $backing_file`
     if ! vgs ${CINDER_VOLUME_GROUP}; then
         vgcreate ${CINDER_VOLUME_GROUP} $vg_dev