Fix keystone IDP setup

The current version does not include the os_keystone role correctly,
as it runs the whole os_keystone role again and ignores the
tasks_from: parameter.

This fix has been tested and now it correctly configures the SP/IDP
configuration.

Change-Id: I3c57c3aab3cacfd5732b9bf5e251a7a8b654d4f5
Closes-Bug: 1908510

playbooks/os-keystone-install.yml

@@ -162,7 +162,9 @@
     - "defaults/{{ install_method }}_install.yml"
   tags:
     - keystone
-  roles:
-    - role: os_keystone
-      tasks_from: main_keystone_federation_sp_idp_setup.yml
+  tasks:
+    - name: "Post configure SP/IDP"
+      include_role:
+        name: os_keystone
+        tasks_from: main_keystone_federation_sp_idp_setup.yml