GitLab

A new endpoint (astakos_oauth2) was added to Astakos service.
Add this endpoint to the astakosclient tests.

Do not have a default value from 'link' attribute of IP_LESS_ROUTED
networks. Instead if the admin does not specify a value in
network-create command, uniquely name the networks by with the
BACKEND_PREFIX_ID and network id, e.g. snf-link-42.

Delete related authorization codes and tokens before deleting the client

* PITHOS_ASTAKOS_COOKIE_NAME (not useful any more)
* PITHOS_SERVE_API (in favor of PITHOS_SERVE_API_DOMAIN)

Change setting and url prefixes from `oa2` to 
`oauth2`

Introduce new setting ``PITHOS_SERVE_API_DOMAIN``. When set, all api views
that serve pithos file contents will be restricted to be served only under
the domain specified in the setting value.

Distinguise offline and online token use

Add tests for validate access token endpoint

The astakos authorization endpoint url should be an absolute url.

Instead of raising PermissionDenied redirect to the
object view url to re-initiate the procedure
for acquiring a new access token.