freebsd: add zfs to the default plugins
freebsd: add zfs to the default plugins

Signed-off-by: Samuel Karp <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@samuelkarp.com>

containerd/containerd,dmcgowan/containerd,containerd/containerd,estesp/containerd,dmcgowan/containerd,vdemeester/containerd,estesp/containerd,mikebrow/containerd,vdemeester/containerd,thaJeztah/containerd,mikebrow/containerd,thaJeztah/containerd