[Nsi-wg] Error handling update

Peoples, Here is an updated error handling document. At the request of SURFnet I have added the following two error values: 00502 CHILD_SEGMENT_ERROR Child connection segment error is present. No local varables are added for this error; however, any variables included in the child segment errors are propagated. 00503 MESSAGE_DELIVERY_ERROR Failed message delivery to peer NSA. Include the providerNSA (target) of the failed message. Please have a look at the edits. Tomohrio/Chin - Make sure you are comfortable with the use of 00502 and 00503 values. You may want the errors classified in a different error family. John