Remove unused driver attr in cinder_backends map

Change-Id: Ib684e3f4bcd26e40c5bfde9bec8a1d83563d5460
Signed-off-by: Pavel Glushchak <pglushchak@virtuozzo.com>

ansible/roles/cinder/defaults/main.yml

@@ -121,19 +121,14 @@ openstack_cinder_auth: "{{ openstack_auth }}"
 ####################
 cinder_backends:
   - name: "rbd-1"
-    driver: "ceph"
     enabled: "{{ enable_ceph | bool and cinder_backend_ceph | bool }}"
   - name: "lvm-1"
-    driver: "lvm"
     enabled: "{{ enable_cinder_backend_lvm | bool }}"
   - name: "nfs-1"
-    driver: "nfs"
     enabled: "{{ enable_cinder_backend_nfs | bool }}"
   - name: "hnas-iscsi"
-    driver: "hnas_iscsi"
     enabled: "{{ enable_cinder_backend_hnas_iscsi | bool }}"
   - name: "hnas-nfs"
-    driver: "hnas_nfs"
     enabled: "{{ enable_cinder_backend_hnas_nfs | bool }}"
 
 cinder_enabled_backends: "{{ cinder_backends|selectattr('enabled', 'equalto', true)|list }}"