fix vpn and docker conflct

fix-routes.sh

#!/bin/bash

set -eu -o pipefail

# https://github.com/docker/libnetwork/issues/779#issuecomment-231727303
# this fixes docker unable to start due to ip address conflict

echo "Adding default route to $route_vpn_gateway with /0 mask..."
ip route add default via $route_vpn_gateway

echo "Removing /1 routes..."
ip route del 0.0.0.0/1 via $route_vpn_gateway
ip route del 128.0.0.0/1 via $route_vpn_gateway

openvpn.config

... 
# add the following the openvpn.config
route-up /usr/local/bin/fix-vpn-routes.sh
...