[FIX] auth_oauth: fb and google oauth providers reset on general settings apply

- The res_config.xml file was missing in the manifest (so couldn't check the use of FB and Google OAuth from the general settings)
 - The default value for these oauth configuration were not set

addons/auth_oauth/__openerp__.py

@@ -36,6 +36,7 @@ Allow users to login through OAuth2 Provider.
         'auth_oauth_data.xml',
         'auth_oauth_data.yml',
         'auth_oauth_view.xml',
+        'res_config.xml',
         'security/ir.model.access.csv'
     ],
     'js': ['static/src/js/auth_oauth.js'],

addons/auth_oauth/res_config.py

@@ -34,6 +34,11 @@ class base_config_settings(osv.TransientModel):
         'auth_oauth_facebook_client_id' : fields.char('Client ID'),
     }
 
+    def default_get(self, cr, uid, fields, context=None):
+        res = super(base_config_settings, self).default_get(cr, uid, fields, context=context)
+        res.update(self.get_oauth_providers(cr, uid, fields, context=context))
+        return res
+
     def get_oauth_providers(self, cr, uid, fields, context=None):
         google_id = self.pool.get('ir.model.data').get_object_reference(cr, uid, 'auth_oauth', 'provider_google')[1]
         facebook_id = self.pool.get('ir.model.data').get_object_reference(cr, uid, 'auth_oauth', 'provider_facebook')[1]