Inspect status for EVERY call into lcb

[chvck]

We've recently hit an issue which looked like an lcb issue but after investigation thanks to @avsej it has been identified that we aren't checking the status code return from lcb calls. We should be checking this (and using lcb_strerror_short to make errors human readable) for EVERY call.

[daschl]

In addition to logging, it probably makes sense that if its on a request flow path to error the future properly with the right error.