Configure volume_clear setting per backend

volume_clear is currently set in the DEFAULT section,
but this is a backend specific setting, and therefore
needs to be set in the backend config section.

Change-Id: Ifa3a659bb4768b8915a0f23e7f14b0f3348d93d2
diff --git a/lib/cinder b/lib/cinder
index 2f302c0..762edc4 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -289,6 +289,9 @@
                 default_name=$be_name
             fi
             enabled_backends+=$be_name,
+
+            iniset $CINDER_CONF $be_name volume_clear $CINDER_VOLUME_CLEAR
+
         done
         iniset $CINDER_CONF DEFAULT enabled_backends ${enabled_backends%,*}
         if [[ -n "$default_name" ]]; then
@@ -318,8 +321,6 @@
 
     iniset_rpc_backend cinder $CINDER_CONF
 
-    iniset $CINDER_CONF DEFAULT volume_clear $CINDER_VOLUME_CLEAR
-
     # Format logging
     setup_logging $CINDER_CONF $CINDER_USE_MOD_WSGI