Be more verbose on mkdir failure
Be more verbose on mkdir failure

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

ollie314/lxd,pcdummy/lxd,techtonik/lxd,jsavikko/lxd,Skarlso/lxd,atxwebs/lxd,chrisglass/lxd,mjeanson/lxd,lxc/lxd,erikmack/lxd,atxwebs/lxd,stgraber/lxd,akshaykarle/lxd,ollie314/lxd,stgraber/lxd,pcdummy/lxd,georghopp/lxd,stgraber/lxd,Skarlso/lxd,jsavikko/lxd,mjeanson/lxd,mjeanson/lxd,lxc/lxd,jsavikko/lxd,hallyn/lxd,hallyn/lxd,atxwebs/lxd,techtonik/lxd,stgraber/lxd,pcdummy/lxd,Skarlso/lxd,stgraber/lxd,erikmack/lxd,chrisglass/lxd,lxc/lxd,atxwebs/lxd,lxc/lxd,lxc/lxd,lxc/lxd,Skarlso/lxd,ollie314/lxd,hallyn/lxd,hallyn/lxd,erikmack/lxd,georghopp/lxd,lxc/lxd,stgraber/lxd,akshaykarle/lxd,georghopp/lxd,hallyn/lxd,hallyn/lxd,techtonik/lxd,chrisglass/lxd,akshaykarle/lxd,stgraber/lxd