Make Cinder Auth Strategy configurable

Cinder supports both noauth and keystone auth mode. This patch adds
cinder_auth_strategy variable to have abililty to configure Cinder's
auth strategy

Change-Id: I7454c9340aff06628aa438301106f2ae8897765c

defaults/main.yml

@@ -137,6 +137,8 @@ cinder_service_v3_adminurl: "{{ cinder_service_adminuri }}/v3/%(tenant_id)s"
 cinder_service_v3_internaluri: "{{ cinder_service_internaluri_proto }}://{{ internal_lb_vip_address }}:{{ cinder_service_port }}"
 cinder_service_v3_internalurl: "{{ cinder_service_internaluri }}/v3/%(tenant_id)s"
 
+cinder_auth_strategy: keystone
+
 ## Keystone authentication middleware
 cinder_keystone_auth_plugin: "{{ cinder_keystone_auth_type }}"
 cinder_keystone_auth_type: password

releasenotes/notes/cinder-auth-stragety-02ca99f48ad7739b.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added ``cinder_auth_strategy`` variable to configure Cinder's auth
+    strategy since Cinder can work in noauth mode as well.

templates/cinder.conf.j2

@@ -11,7 +11,7 @@ osapi_volume_workers = {{ cinder_osapi_volume_workers }}
 
 rootwrap_config = /etc/cinder/rootwrap.conf
 api_paste_config = /etc/cinder/api-paste.ini
-auth_strategy = keystone
+auth_strategy = {{ cinder_auth_strategy }}
 
 ## Cinder API's enabled
 enable_v1_api = {{ cinder_enable_v1_api }}