vdkr: enable Docker bridge networking

Enable Docker's default bridge network (docker0, 172.17.0.0/16) inside
the QEMU VM to allow multiple containers to listen on the same internal
port with different host port mappings.

Changes:
- Add iptables package to vdkr-rootfs-image for Docker NAT rules
- Change dockerd options in vdkr-init.sh:
  - Set --iptables=true (was false)
  - Remove --bridge=none to enable default docker0 bridge

This enables the workflow:
  vdkr run -d -p 8080:80 --name nginx1 nginx:alpine
  vdkr run -d -p 8081:80 --name nginx2 nginx:alpine
  # Both work - each container gets its own 172.17.0.x IP

Previously with --network=host (the old default), both containers would
try to bind port 80 on the VM's single IP, causing conflicts.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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