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 ...

This is a PR that goes to a feature branch.
No need to include the complete change of paths in functests in this PR, it can be done in a PR of its own.
However, if you *want* to include that fix in this very same PR, feel free :-)