Ensure that computer can destroy the software.

Also commit test skeleton.

Mainly give access for group/company to Hosting Subscription and its module.

As explicit is better then implicit give explicitly group/company access to
other modules and portal types even if access was already given by role/member.

Also use typical owner (zope) instead of artificial ones (admin or
ERP5TypeTestCase).

Run only 10 operations and increase priority a bit in order to be nicer to
realtime part of the system.

Each call will now be reported by the consumption API.

Does not uglily raise, just exits and don't log too many useless things
on log.

Busy computer partition shall have exactly one related Software Instance, but
might have any related Slaves.