Don't depend on vdirsyncer logging code
Don't depend on vdirsyncer logging code

And avoid random breakage if user has a "wrong" version of vdirsyncer
installed.

pdav/khal,sithglan/khal,hobarrera/khal,pimutils/khal,sheeprine/khal,dzoep/khal,sheeprine/khal,geier/khal,sithglan/khal,sdx23/khal