Made sip_subscribe_presence script use sip_subscribe_interval setting

Ignore-this: 46bb5e92e68594babd203e094715043b

darcs-hash:20090222161616-1e3d8-a9dba98cc672ebd668ef1842ee8a7ffeb5d5c8df
Made sip_subscribe_rls script use sip_subscribe_interval setting

Ignore-this: 9dd82d75108ccc2d7e64c14673074596

darcs-hash:20090222161925-1e3d8-3dfaae89794032d750bd9ac55c85b18efafd3eb3