Check X-Died header in LWP::UserAgent responses
Check X-Died header in LWP::UserAgent responses

LWP::UserAgent will return a successful response with the `X-Died` header set if there's a `die()` in a callback. Trap that as an error.

GlobalNOC/GRNOC-WebService-Client,GlobalNOC/GRNOC-WebService-Client