- make url script return no url if there are not connection parameters
- update tests accordingly

   ...to failures on password generation

See merge request nexedi/slapos.core!604

See merge request nexedi/slapos.core!603

   The password has to work accordinally the policy, if fail retry a few times.

   There is no more patch

  backport from ERP5

   In past, we used to rely on ERP5 Login (passwordless) for authentication via Certificates, but we switched to use excusively a dedicated portal type (Certificate Login).

   The ERP5 Login now follows the default implementation, so no need custom scripts.

   This helps to figure out what it is really testing.

  Some scripts were removed and on other cases started to be tested.

   After 6 years, it is expected that all instances are migrated. The migration is outdated, since it we use Certificate Login rather them ERP5 Login on Compute Nodes and Software Instances.

    There is no need to pre-create it, since it would be required you go throw External service (Facebook or Google) to create the default connectors.

See merge request nexedi/slapos.core!601

See merge request nexedi/slapos.core!600

See merge request nexedi/slapos.core!599

See merge request nexedi/slapos.core!596

See merge request nexedi/slapos.core!595

When an user belonged to a group before running slapformat, the user was previously
removed from that group. This commit avoids it by simply appending SlapOS
additional groups.

  This API will be refactored on the new API