[FIX] models: wrong var used in _compute_display_name(), fixes issue #1002
Merge pull request #1018 from odoo-dev/8.0-fix-display-name-rco

[FIX] models: wrong var used in _compute_display_name(), fixes issue #1002
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-win32