Impacted versions: 8.0

Steps to reproduce: try to install hw_escpos

Current behavior: odoo shutdown 

Expected behavior: module installed without problems

Video/Screenshot link (optional):

 2016-09-05 14:06:19,494 8348 WARNING POS-test openerp.addons.base.module.module: docutils' system message present: <system_message level="2" line="3" source="<string>" type="WARNING"><paragraph>Title underline too short.</paragraph><literal_block xml:space="preserve">Kassenbeleg-Drucker (ESC/POS) Hardware Treiber ========================================</literal_block></system_message> 2016-09-05 14:06:19,508 8348 WARNING POS-test openerp.addons.base.module.module: docutils' system message present: <system_message level="2" line="3" source="<string>" type="WARNING"><paragraph>Title underline too short.</paragraph><literal_block xml:space="preserve">Kassenbeleg-Drucker (ESC/POS) Hardware Treiber ========================================</literal_block></system_message