Remove 'real_stix_objs1' as it is unused in the tests

stix2/test/conftest.py

@@ -154,11 +154,6 @@ def stix_objs2():
     return [ind6, ind7, ind8]
 
 
-@pytest.fixture
-def real_stix_objs1(stix_objs1):
-    return [stix2.parse(x) for x in stix_objs1]
-
-
 @pytest.fixture
 def real_stix_objs2(stix_objs2):
     return [stix2.parse(x) for x in stix_objs2]