Modified xcap_pres_rules to use configuration framework

Ignore-this: c4de5a3d179d13f765af103591652246

darcs-hash:20090331121321-1e3d8-dd6e5a7e2c255d3438c7e91bc7a2559182d02aa6
Modified xcap_rls_services to use configuration framework

Ignore-this: efae4e4dc00e8e01d0a82dd23d70f893

darcs-hash:20090331130341-1e3d8-cd5f430c17937d13feea6253255fdc77cad4a220