See merge request !696

This will support buildout extension to download from gitlab API with
authentication.

The code has already been refactored a bit to be able to pass a
download instance to SoftwareReleaseSchema, for now to instanciate only
one Download but in the future this might be extended to pass some
configuration to the Download instance.

The performance was much worse.

Workflow state was not the correct one.

See 76edda30

This partially reverts commit 14c39681.

There is no need for custom the actions, as on slapos_panel fast input is
used instead.

Keep for now the older state name for ensure consistency with the current
usage.

   This was replaced on the panel so, no need to have it on workflow action. This may reduce the delta on the workflow itself.

   For sure, we won't calculate worklist from this form

    This workflow isn't used any more since the re-implementation.

   This prevents produce inconsistent objects whenever system evolve.

  New string to translate
  int to bool change on XML

  DeprecationWarning: <Workflow at instance_slap_interface_workflow>: Script calling Instance_checkConsistency instead of script_Instance_checkConsistency

   Provide all common options as a method, so it is easy to understand security.

moved from erp5 SR test suite

See merge request nexedi/slapos.core!705

adjusted to use findFreeTCPPortRange and fix typing / formatting errors