[FIX] stock: appropriate chatter log when picking done
[FIX] stock: appropriate chatter log when picking done

Commit d349584 solved the state change tracking of pickings, and
moreover prevents unnecessary state changes to be recorded. However,
this also prevents the state "Done" to be recorded in the chatter.

Saving properly the state change for the picking might be quite tricky,
since the stock processes sometimes imply unreservation/rereservation of
quants, and therefore lead to several state changes inside the same
process.

opw-680343

laslabs/odoo,ygol/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,dfang/odoo,Elico-Corp/odoo_OCB,ygol/odoo,microcom/odoo,bplancher/odoo,microcom/odoo,microcom/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo,storm-computers/odoo,laslabs/odoo,dfang/odoo,bplancher/odoo,hip-odoo/odoo,dfang/odoo,laslabs/odoo,microcom/odoo,ygol/odoo,dfang/odoo,microcom/odoo,dfang/odoo,bplancher/odoo,bplancher/odoo,laslabs/odoo,microcom/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,ygol/odoo,storm-computers/odoo,bplancher/odoo,laslabs/odoo,bplancher/odoo,hip-odoo/odoo,ygol/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,Elico-Corp/odoo_OCB,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,ygol/odoo