cubicweb-inventory #2725676 device: add an "unused" WF state [not validated]

to identify devices not used anymore in the infrastructure

prioritynormal
typebug
done in0.2.0
load0.500
load left0.000
closed by#345c0148dd5b [wf] add an 'unused' workflow state for a Device (closes #2725676)
patch[wf] add an 'unused' workflow state for a Device (closes #2725676) [applied]