test: use dataset as pool || existing pool for zfs
test: use dataset as pool || existing pool for zfs

Signed-off-by: Christian Brauner <48455ab3070520a2d174545c7239d6d0fabd9a83@ubuntu.com>

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