[1.8.x] Fixed #24345 -- Isolated sitemaps_tests from contenttypes_tests; refs #11505
[1.8.x] Fixed #24345 -- Isolated sitemaps_tests from contenttypes_tests; refs #11505

Backport of f668bac9d223408627ca92b2281cf7110039510b from master

pquentin/django,pquentin/django,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,h4r5h1t/django-hauthy,pquentin/django