remove subreaper config item
containerd v1.0.0-rc.0 changed the subreaper config entry to the
negative given subreaper "on" is the default. However, linuxkit
does not need to change the default subreaper setting so removing
the now invalid config line.
@@ -2,7 +2,6 @@ state = "/run/containerd"
root = "/var/lib/containerd"
snapshotter = "io.containerd.snapshotter.v1.overlayfs"
differ = "io.containerd.differ.v1.base-diff"
-subreaper = false
[grpc]
address = "/run/containerd/containerd.sock"
