Fixed ldap::server modules for Ubuntu and Debian.

ldap/templates/slapd.conf.erb

@@ -27,6 +27,10 @@ argsfile	/var/run/openldap/slapd.args
 modulepath <%= modulepath %>
 moduleload ppolicy.la
 moduleload syncprov.la
+<%   if ['Ubuntu','Debian'].index(operatingsystem) -%>
+moduleload back_hdb.la
+moduleload back_monitor.la
+<%   end -%>
 <%   if has_variable?('ldap_server_modules') -%>
 <%     ldap_server_modules.each do |name| -%>
 moduleload <%= name %>.la