Finish migration to version 10.0

Do not raise ConnectionError if we get a response
Use ConnectionError from requests lib instead of overriding it
Fix push_to_pingen (writes on state as for cron), remove unneeded loops

pingen/models/__init__.py

@@ -0,0 +1,8 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from . import ir_attachment
+from . import pingen
+from . import pingen_document
+from . import res_company
+from . import base_config_settings