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 The migration is outdated, since it we use Certificate Login rather them ERP5 Login on Compute Nodes and Software Instances.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 !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

See merge request nexedi/slapos.core!591

   In the case of checkNotCycle, the re-recheck would always fail on a disconnected tree first, so it is mandatory patch the checkConnected (to skip) during the tests.

See merge request nexedi/slapos.core!579

- change url parameters for dispatch link
- use monitoring app landing url
- add url-user-pass parameters to monitor url

See merge request nexedi/slapos.core!592

See merge request nexedi/slapos.core!590