remove session scope from datasource test fixtures

tests/conftest.py

@@ -94,7 +94,7 @@ def increment_cache_key_prefix():
     cache.key_prefix = "t{0}".format(key_prefix_counter)
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture()
 def jobs_ds():
     from django.conf import settings
     from treeherder.model.models import Datasource
@@ -106,7 +106,7 @@ def jobs_ds():
     )
 
 
-@pytest.fixture(scope='session')
+@pytest.fixture()
 def objectstore_ds():
     from django.conf import settings
     from treeherder.model.models import Datasource

tests/model/derived/refdata.py

@@ -165,3 +165,4 @@ def test_refdata_manager(refdata, params):
     # assert row[version] == 'v1'
     # assert row[version_timestamp] == 1366290144
     # assert row[active_status] == 'active'
+