Remove unused code and minor bug fixes

Move out tests related to Regularization requets to testSlapOSCRMRegularisationRequestSkins

   Move code related to Certificate Authorithy to generic bt5
   Certificate authority is installed via erp5_certificate_authority bt5
   Person re-definition was moved into erp5_certificate_authority business templates

   extra:
      slapos_configurator: Update test to include new dependency

Use the new URL that are worldwide accessible

/reviewed-on nexedi/slapos.core!126

  This was accidently reverted.

  This save us to call a jio_get later per line in a loop

  The API must relies on Hateoas API based on JIO only.

  Ensure that path is correct if hateoas_url don't finish with '/'

In case, destruction was already requested, the job of this alarm is already over, it can be considered,
cleaned.

Use JSON serialisation case by reusing the KVM Cluster Case.

This code was originally written by Alain Takoudjou, I'm just porting and updating to this new code base.

/reviewed-on !121