mdb: add a machine status field

[Rémi Audebert]

A machine status field will help us report any problem we have with a machine to the Bocal.

Suggested fields to add:

• BooleanField is_faulty
• TextField is_faulty_details

Side issues:

• Integration with the usermap
• Display the issue on the screen if the machine is booted (integration with netboot ie. the high tech version of a post-it)

[Alexandre Macabies]

I suggest something more generic:

• EnumField state {WORKING, MAINTENANCE, OUTOFORDER}
• TextField state_details

As such, is_usable ← state == WORKING.

[Rémi Audebert]

I suggest keeping it simple.

[Rémi Audebert]

@serialk @Dettorer what do you think?

[Paul Hervot]

I prefer the boolean field. Though I would rather name it "is_faulty" (for example) as the problem may not make the machine completely unusable while still needing to be reported.

[Alexandre Macabies]

Waiting for pull request #5 to be reviewed, as it introduced changes in mdb models (and migrations).

[Alexandre Macabies]

Added in 89647ff74f32. Keeping this issue open for the side tasks.