NGSI10 Subscriptions with ServicePath

### Also not a PR

This 'failed test' comes complete with the logfile of the broker, and a description of the test (see the file SUBS_PATH), including contents in mongo after the test.

## Will NOT be merged, but discarded after discussion


I believe we said (and I looked it up) that this is checked in a layer above (assuring that max one item is inside the vector).
That might have been another case, I will look it up again.