Add default user role for Keystone & Horizon and tasks to create it

In Keystone v3, the _member_ role is not implicitly created on first
use like it is in v2.

This patch adds variables to define the default role name for users:
 - keystone_default_role_name:
   this is the default role name from Keystone's point of view
 - horizon_default_role_name:
   this is the default user role from Horizon's point of view

Both Keystone and Horizon's tasks ensure that the role they're using
are registered in the Keystone database.

To maintain backwards compatibility the default value for both
variables is '_member_'.

DocImpact
Closes-bug: 1474916
Change-Id: Ie01e1771c0b435815dfe55fc0ba9a6d803ebe958

defaults/main.yml

@@ -91,6 +91,9 @@ horizon_keystone_endpoint: "{{ keystone_service_internalurl }}"
 ## alternatively, you can set horizon to turn off ssl verification for Keystone
 horizon_ssl_no_verify: "{{ (keystone_service_adminuri_insecure | bool or keystone_service_internaluri_insecure | bool) | default(false) }}"
 
+## The role which Horizon should use as a default for users
+horizon_default_role_name: _member_
+
 ## Launch instance
 horizon_launch_instance_legacy: True
 horizon_launch_instance_ng: False

tasks/horizon_service_setup.yml

@@ -0,0 +1,34 @@
+---
+# Copyright 2015, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# Add the default user role
+- name: Ensure default keystone user role
+  keystone:
+    command: "ensure_role"
+    token: "{{ keystone_auth_admin_token }}"
+    endpoint: "{{ keystone_service_adminurl }}"
+    role_name: "{{ horizon_default_role_name }}"
+    insecure: "{{ keystone_service_adminuri_insecure }}"
+  when: >
+    keystone_auth_admin_token is defined
+    and keystone_service_adminurl is defined
+    and keystone_service_adminuri_insecure is defined
+  register: add_member_role
+  until: add_member_role|success
+  retries: 5
+  delay: 10
+  tags:
+    - horizon-member-config

tasks/main.yml

@@ -28,6 +28,8 @@
 
 - include: horizon_ssl_user_provided.yml
 
+- include: horizon_service_setup.yml
+
 - include: horizon_apache.yml
 
 - name: Flush handlers

templates/horizon_local_settings.py.j2

@@ -168,7 +168,8 @@ OPENSTACK_HOST = "{{ horizon_keystone_host }}"
 OPENSTACK_KEYSTONE_URL = "{{ horizon_keystone_endpoint }}"
 {% endif %}
 
-OPENSTACK_KEYSTONE_DEFAULT_ROLE = "_member_"
+# The default role assigned to users
+OPENSTACK_KEYSTONE_DEFAULT_ROLE = "{{ horizon_default_role_name }}"
 
 {% if keystone_sp is defined %}
 # Enables keystone web single-sign-on