Add Domain subtree to keystone LDAP structure

Fixes Bug1144927
This fix adds a Domain subtree to the initial
LDAP structure for configuring keystone's LDAP.

Change-Id: I6ec06efc9e0a40bfc81d838b9f0d6167e9441dff
diff --git a/files/ldap/openstack.ldif b/files/ldap/openstack.ldif
index 00c9861..2b76372 100644
--- a/files/ldap/openstack.ldif
+++ b/files/ldap/openstack.ldif
@@ -20,6 +20,10 @@
 objectClass: organizationalUnit
 ou: Projects
 
+dn: ou=Domains,dc=openstack,dc=org
+objectClass: organizationalUnit
+ou: Domains
+
 dn: cn=9fe2ff9ee4384b1894a90878d3e92bab,ou=Roles,dc=openstack,dc=org
 objectClass: organizationalRole
 ou: _member_