Update pytest

This also moves the conftest.py file to a module,
this is the recommend way https://docs.pytest.org/en/latest/pythonpath.html#pythonpath
And fix some problems with tests on the corporate site.

Author: stsewd

conftest.py renamed to readthedocs/conftest.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 import pytest
 from django.conf import settings
 from rest_framework.test import APIClient

requirements/testing.txt

@@ -2,14 +2,9 @@
 -r local-docs-build.txt
 
 django-dynamic-fixture==2.0.0
-# pytest 4.2 is incompatible with pytest-django 3.4.6
-pytest==4.1.1  # pyup: <4.2
-# pytest-django 3.4.7 break our tests from corporate site
-# probably a bug related to overriding django settings in
-# previous tests
-pytest-django==3.4.6  # pyup: <3.4.7
-# pytest-xdist >1.27 requires pytest >4.1
-pytest-xdist==1.27.0  # pyup: ignore
+pytest==5.2.0  # pyup: <4.2
+pytest-django==3.5.1  # pyup: <3.4.7
+pytest-xdist==1.30.0  # pyup: ignore
 pytest-cov==2.7.1
 apipkg==1.5
 execnet==1.7.1