title: Odoo 10 starting wrong with systemd service using config file
body: <p>I have been running my odoo 10 installation with command /opt/odoo/odoo10.0/odoo-bin and it has worked fine. </p>
  
  <p>Now I want to create a service to enable/start/stop it when i want. I'v been trying to accomplish it with systemd, but the odoo starts differently than with the script above. </p>
  
  <p>When I start it as a service it thinks that I'm using it for the first time and asks to create a database etc. Like It's not using the config file. Have I made something wrong?</p>
  
  <p>This is my service file /etc/systemd/system/odoo.service:</p>
  
  <pre><code>[Unit]
  Description=Odoo Open Source ERP and CRM
  Requires=postgresql.service
  After=network.target postgresql.service
  
  [Service]
  Type=simple
  PermissionsStartOnly=true
  SyslogIdentifier=odoo-server
  User=odoo
  Group=odoo
  ExecStart=/opt/odoo/odoo-10.0/odoo-bin --config=/etc/odoo.conf
  WorkingDirectory=/opt/odoo/odoo-10.0/
  StandardOutput=journal+console
  
  [Install]
  WantedBy=multi-user.target
  </code></pre>