For all planned Upgrade Decisions, create an event (messaging) for inform about the upgrade, with links to Accept/Reject it.

Planned is introduced for indicate upgrade preparation or in fully automated scenarios to be the place to create messages/notificafications.

This is needed for auto-generate references

- Started Upgrade Decision trigger request or supply which include softwares on computers or change SR of the Hosting Subscriptions
- Alarm to process Started Upgrade Decisions

Tests still missing

One is enough.

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.

Move all the code inside vifib_fiber bt5.

Previous location: https://gitorious.org/vifib/slapos-master