Set same hostname for each cinder-volume for Ceph backend.

Change-Id: I1e76a935286d48c4c449c14bef7d8eeb279fc01a
diff --git a/cinder/control/backend/ceph.yml b/cinder/control/backend/ceph.yml
index 1026f68..3b036d4 100644
--- a/cinder/control/backend/ceph.yml
+++ b/cinder/control/backend/ceph.yml
@@ -11,3 +11,4 @@
           user: ${_param:cinder_storage_user}
           secret_uuid: ${_param:cinder_storage_secret_uuid}
           client_cinder_key: ${_param:cinder_storage_client_key}
+          host: ceph
diff --git a/cinder/volume/backend/ceph.yml b/cinder/volume/backend/ceph.yml
index 6560add..945f2f9 100644
--- a/cinder/volume/backend/ceph.yml
+++ b/cinder/volume/backend/ceph.yml
@@ -1,7 +1,7 @@
 parameters:
   cinder:
     volume:
-      message_queue: 
+      message_queue:
         ha_queues: true
       enabled: true
       notification: true
@@ -15,3 +15,4 @@
           user: ${_param:cinder_storage_user}
           secret_uuid: ${_param:cinder_storage_secret_uuid}
           client_cinder_key: ${_param:cinder_storage_client_key}
+          host: ceph