fix ceph config file path variable

CEPH_CONF does not exist anymore, resulting both cinder-volume and
cinder-backup being configured with an empty rbd_ceph_conf option.
Using CEPH_CONF_FILE to fix this.

Change-Id: I1aa590aba900a4a94698917e45a0ea5c6f497f18
Signed-off-by: Sébastien Han <seb@redhat.com>
diff --git a/lib/cinder_backends/ceph b/lib/cinder_backends/ceph
index 9bff5be..ba86ccf 100644
--- a/lib/cinder_backends/ceph
+++ b/lib/cinder_backends/ceph
@@ -45,7 +45,7 @@
 
     iniset $CINDER_CONF $be_name volume_backend_name $be_name
     iniset $CINDER_CONF $be_name volume_driver "cinder.volume.drivers.rbd.RBDDriver"
-    iniset $CINDER_CONF $be_name rbd_ceph_conf "$CEPH_CONF"
+    iniset $CINDER_CONF $be_name rbd_ceph_conf "$CEPH_CONF_FILE"
     iniset $CINDER_CONF $be_name rbd_pool "$CINDER_CEPH_POOL"
     iniset $CINDER_CONF $be_name rbd_user "$CINDER_CEPH_USER"
     iniset $CINDER_CONF $be_name rbd_uuid "$CINDER_CEPH_UUID"
@@ -66,7 +66,7 @@
         sudo chown $(whoami):$(whoami) ${CEPH_CONF_DIR}/ceph.client.${CINDER_BAK_CEPH_USER}.keyring
 
         iniset $CINDER_CONF DEFAULT backup_driver "cinder.backup.drivers.ceph"
-        iniset $CINDER_CONF DEFAULT backup_ceph_conf "$CEPH_CONF"
+        iniset $CINDER_CONF DEFAULT backup_ceph_conf "$CEPH_CONF_FILE"
         iniset $CINDER_CONF DEFAULT backup_ceph_pool "$CINDER_BAK_CEPH_POOL"
         iniset $CINDER_CONF DEFAULT backup_ceph_user "$CINDER_BAK_CEPH_USER"
         iniset $CINDER_CONF DEFAULT backup_ceph_stripe_unit 0