Workaround zfs lock on destroy
Workaround zfs lock on destroy

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

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