[IMP] account: add log warning when skipping a test

Accounting tests are done 'post install' because
their generally requried a chart of account to be
installed before test execution.
If a test is launched before l10n install, the test
will be skipped but nobody will know it, unless you
read all the logs of your server.
When skipping a test, a warning should be displayed.

addons/account/tests/account_test_classes.py

@@ -1,4 +1,8 @@
 # -*- coding: utf-8 -*-
+
+import logging
+_logger = logging.getLogger(__name__)
+
 from odoo.tests.common import HttpCase
 from odoo.exceptions import ValidationError
 
@@ -16,6 +20,7 @@ class AccountingTestCase(HttpCase):
         super(AccountingTestCase, self).setUp()
         domain = [('company_id', '=', self.env.ref('base.main_company').id)]
         if not self.env['account.account'].search_count(domain):
+            _logger.warn('Test skipped because there is no chart of account defined ...')
             self.skipTest("No Chart of account found")
 
     def check_complete_move(self, move, theorical_lines):