Slapos_cache include Shacache implementation on Slapos Master, making it also a shacache provider.
The configuraiton was moved from vifib_erp5 to slapos_cache bt5.

On Tests, Includes slapos_cache and reorganise order of bt5 in order to respecting the auromatic, dependencies handling.

This reverts commit 2f7f6692.

As interaction is called early it can now miss the specialise setup, so it
have to be caught explicitly.

Thanks to this roles are updated in same transaction.

Validating computer may help the system to work.

Because is set later, it triggers consistency error before being set.

Plugin is already loaded in SlapOS product.

It should be replaced by SlapOSShadowAuthenticationPlugin.

It is nice to see error messages w/o swallowing exceptions while running
manually.

Goal of the configurator is to install those bt5.

Promise are not related to the configurator but to the 'core' functionnalities.

Only test fresh installation for now.