[REF] odoo-shippable: Install 'libmysqlclient-dev' apt package
OCA projects are using 'mysqlclient' from requirements.txt This package requires libmysqlclient-dev in order to avoid the following error:
- "OSError: mysql_config not found"
Travis has installed 'libmysqlclient-dev' apt package so runbot is failing but travis is not.
In order to show the same result we are installing this dependency early