fix test_importing_posts_and_attachments for the new url structure
fix test_importing_posts_and_attachments for the new url structure

pluser/nikola,getnikola/nikola,atiro/nikola,gwax/nikola,schettino72/nikola,TyberiusPrime/nikola,okin/nikola,xuhdev/nikola,lucacerone/nikola,techdragon/nikola,JohnTroony/nikola,gwax/nikola,berezovskyi/nikola,lucacerone/nikola,x1101/nikola,okin/nikola,immanetize/nikola,knowsuchagency/nikola,xuhdev/nikola,berezovskyi/nikola,gwax/nikola,masayuko/nikola,masayuko/nikola,okin/nikola,s2hc-johan/nikola,s2hc-johan/nikola,yamila-moreno/nikola,andredias/nikola,techdragon/nikola,jjconti/nikola,yamila-moreno/nikola,getnikola/nikola,berezovskyi/nikola,andredias/nikola,xuhdev/nikola,okin/nikola,immanetize/nikola,immanetize/nikola,yamila-moreno/nikola,JohnTroony/nikola,techdragon/nikola,schettino72/nikola,s2hc-johan/nikola,knowsuchagency/nikola,atiro/nikola,andredias/nikola,x1101/nikola,JohnTroony/nikola,knowsuchagency/nikola,TyberiusPrime/nikola,atiro/nikola,TyberiusPrime/nikola,getnikola/nikola,pluser/nikola,wcmckee/nikola,schettino72/nikola,wcmckee/nikola,getnikola/nikola,xuhdev/nikola,x1101/nikola,jjconti/nikola,lucacerone/nikola,jjconti/nikola,wcmckee/nikola,pluser/nikola,masayuko/nikola