complete functional tests for all URLs (old and new)

### Description
New URLs.
Added an alternative path for ALL requests.
What was '/ngsi9/XXX' is now also '/v1/registry/XXX'.
What was /ngsi10/XXX' is now also '/v1/XXX'.
Also the administrative requests /log, /statistics, /version, etc have been added a path '/v1/admin/'.

All paths, new and old tested in 4 new functional tests.
All old functional tests should now use /v1/* instead of /ngsi9/* and /ngsi10/*. A few functional tests have been converter, but just a few ...

As a double-chek, I would run a recursive grep on cases/ directory looking for "ngsi9", "NGSI9", "ngsi10", "NGSI10" (except in the 599_new_url_paths/ directory, of course) in order to check that no ocurrence remains and that our "official" set of test harness always use "/v1" from now on.