unittests: new session style for tests_08*

unittests/tests_080_users.py

 #!/usr/bin/python3 env
-# provides GargTestRunner.testdb_session
-from unittests.framework import GargTestRunner
-from Django import TestCase
+
+from gargantext.util.db import session
+from django import TestCase
+
 
 class UserRecipes(TestCase):
     def setUp(self):
         #before any test
-        self.session = GargTestRunner.testdb_session
+        self.session = session
         self.client = Client()
     def tearDown(self):
         #after any test

unittests/tests_081_projects.py

 #!/usr/bin/python3 env
+
+from django.test import TestCase
+
 class ProjectsRecipes(TestCase):
     def setUp(self):
         #before anytest
-        self.session = GargTestRunner.testdb_session
+        self.session = session
         self.client = Client()
 
     def tearDown(self):