cinder: backend_host and volume_backend_name from 17.1

This change makes sure that
- makes sure that volume_backend_name has the same value
  as the overall section, matching the value from 17.1;
- adds backend_host=hostgroup to the templates for the cinder
  volume configuration which were missing it.

If these keys are not assigned the same value as in 17.1,
cinder won't be able to manage the volumes created before
the adoption, because they will be assigned a new value
for os-vol-host-attr:host, and the value for volume_backend_name
set so far did not match the old value.

Signed-off-by: Luigi Toscano <ltoscano@redhat.com>

Author: tosky

tests/roles/cinder_adoption/templates/cinder_volume_netapp_iscsi.yaml.j2

@@ -7,7 +7,8 @@ spec:
             - storage
           customServiceConfig: |
             [{{ cinder_netapp_backend }}]
-            volume_backend_name=ontap-iscsi
+            backend_host=hostgroup
+            volume_backend_name={{ cinder_netapp_backend }}
             volume_driver=cinder.volume.drivers.netapp.common.NetAppDriver
             netapp_storage_protocol=iscsi
             netapp_storage_family=ontap_cluster

tests/roles/cinder_adoption/templates/cinder_volume_netapp_nfs.yaml.j2

@@ -7,7 +7,8 @@ spec:
             - storage
           customServiceConfig: |
             [{{ cinder_netapp_backend }}]
-            volume_backend_name=ontap-nfs
+            backend_host=hostgroup
+            volume_backend_name={{ cinder_netapp_backend }}
             volume_driver=cinder.volume.drivers.netapp.common.NetAppDriver
             netapp_storage_protocol=nfs
             netapp_storage_family=ontap_cluster

tests/roles/cinder_adoption/templates/cinder_volume_pure_fc.yaml.j2

@@ -7,7 +7,8 @@ spec:
             - storage
           customServiceConfig: |
             [{{ cinder_pure_backend }}]
-            volume_backend_name=pure-fc
+            backend_host=hostgroup
+            volume_backend_name={{ cinder_pure_backend }}
             volume_driver=cinder.volume.drivers.pure.PureFCDriver
             consistencygroup_support=True
           customServiceConfigSecrets: