Switch to using the generated disk when launching bhyve.

scripts/launch_bhyve.bash

@@ -34,6 +34,7 @@ ifconfig bridge0 addm tap1
 # -s virtual PCI slots
 # -P force guest CPU to exit when PAUSE instruction detected
 set +e
+disk_image=$(readlink -f ../scripts/build_image/dib.img)
 bhyve \
     -c 1 \
     -m 1024M \
@@ -44,7 +45,7 @@ bhyve \
     -u \
     -s 0,hostbridge \
     -s 31,lpc \
-    -s 4:0,virtio-blk,/vm/docker/disk0.img \
+    -s 4:0,virtio-blk,$disk_image \
     -s 5:0,virtio-net,tap1,mac=58:9c:fc:09:c3:ba \
     -s 6:0,virtio-rnd \
     -s "7:0,virtio-9p,docker=$DOCKERDIR" \