Downcase Admin user role to support nova's new policy engine

 * Fixes bug 919373

Change-Id: If786f59995327f15fe72420950c7109e2eb0a307
diff --git a/files/keystone.conf b/files/keystone.conf
index a646513..6d0fd7e 100644
--- a/files/keystone.conf
+++ b/files/keystone.conf
@@ -64,7 +64,7 @@
 cert_required = True
 
 #Role that allows to perform admin operations.
-keystone-admin-role = Admin
+keystone-admin-role = admin
 
 #Role that allows to perform service admin operations.
 keystone-service-admin-role = KeystoneServiceAdmin