First option is what Giovanny mentioned,

But you can also browse your project in eclipse, find the file odoo-server and right-click on it, select Run as python run.

Now you have a run configuration, and you can edit it (add config file or other options according to your needs...
(so no actual need to rename file to openerp-server.py )

Hope it helps.

In server there's a file named openerp-server, in eclipse you must rename it openerp-server.py