contacts: Make the contact update and photo tests individually idempotent
contacts: Make the contact update and photo tests individually idempotent

Helps: bgo#633359

Pecisk/libgdata,Pecisk/libgdata-gtasks,Pecisk/libgdata-gtasks,Distrotech/libgdata,Pecisk/libgdata,pwithnall/libgdata,Distrotech/libgdata,Pecisk/libgdata,GNOME/libgdata,pwithnall/libgdata,Pecisk/libgdata-gtasks,Distrotech/libgdata