contacts: Split property tests out from the insertion test
contacts: Split property tests out from the insertion test

Helps: bgo#633359

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