Removed unused import in sipsimple.applications.rlsservices

Ignore-this: c8b815f23ce03f047c047f3dac97f30d

darcs-hash:20090329233908-1e3d8-77920ad28c88a99be6f125820ee76aaa417d454e
Added missing import in sipsimple.applications.util

Ignore-this: 7f4249086dbf79bfe0d77ab187c0ea35

darcs-hash:20090329234024-1e3d8-d6db3c7e05077ddf47ecc562529dd0bfdb2f4a12