rename rest handler module

Author: giancarloromeo

services/web/server/src/simcore_service_webserver/api_keys/_handlers.py renamed to services/web/server/src/simcore_service_webserver/api_keys/_rest.py

@@ -8,7 +8,7 @@
 from ..products.plugin import setup_products
 from ..rabbitmq import setup_rabbitmq
 from ..rest.plugin import setup_rest
-from . import _handlers, _rpc
+from . import _rest, _rpc
 
 _logger = logging.getLogger(__name__)
 
@@ -26,7 +26,7 @@ def setup_api_keys(app: web.Application):
 
     # http api
     setup_rest(app)
-    app.router.add_routes(_handlers.routes)
+    app.router.add_routes(_rest.routes)
 
     # rpc api
     setup_rabbitmq(app)