lxd/storage/drivers/driver/dir/volumes: Updates CreateVolume to use volumeSize
lxd/storage/drivers/driver/dir/volumes: Updates CreateVolume to use volumeSize

And updates usage of genericVFSResizeBlockFile.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

Skarlso/lxd,lxc/lxd,stgraber/lxd,mjeanson/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,atxwebs/lxd,Skarlso/lxd,lxc/lxd,mjeanson/lxd,mjeanson/lxd,hallyn/lxd,stgraber/lxd,atxwebs/lxd,lxc/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,hallyn/lxd,Skarlso/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,Skarlso/lxd,lxc/lxd,hallyn/lxd,atxwebs/lxd,lxc/lxd,hallyn/lxd