[FIX] date_range: Pass integration tests

at_install should be False

date_range/tests/test_date_range.py

@@ -7,7 +7,7 @@ from odoo.exceptions import ValidationError
 
 class DateRangeTest(TransactionCase):
     post_install = True
-    at_install = True
+    at_install = False
 
     def setUp(self):
         super(DateRangeTest, self).setUp()

date_range/tests/test_date_range_generator.py

@@ -8,7 +8,7 @@ from dateutil.rrule import MONTHLY
 
 class DateRangeGeneratorTest(TransactionCase):
     post_install = True
-    at_install = True
+    at_install = False
 
     def setUp(self):
         super(DateRangeGeneratorTest, self).setUp()

date_range/tests/test_date_range_type.py

@@ -9,7 +9,7 @@ from odoo.exceptions import ValidationError
 
 class DateRangeTypeTest(TransactionCase):
     post_install = True
-    at_install = True
+    at_install = False
 
     def setUp(self):
         super(DateRangeTypeTest, self).setUp()