Fix monasca auth variable

Perform the refactoring of the auth field from change #552863

TrivialFix
Partially-Implements: blueprint monasca-roles

Change-Id: I0a87cc3cb40df5e1c927bcd8ff4bd33e44fe4172

ansible/roles/monasca/tasks/register.yml

@@ -44,7 +44,7 @@
       password: "{{ monasca_keystone_password }}"
       role: "admin"
       region_name: "{{ openstack_region_name }}"
-      auth: "{{ '{{ monasca_openstack_auth }}' }}"
+      auth: "{{ monasca_openstack_auth }}"
   run_once: True
 
 - name: Creating monasca roles