[consul] Ensure we always bind to the instance's main private IP

[gozer]

This is something we have done in CI, when dealing with docker's extra local interfaces, so somthing like:

#!/bin/bash

IP_ADDR=$(curl --retry 60 -fks http://169.254.169.254/latest/dynamic/instance-identity/document | jq .privateIp' -r)

# Multiple IPs cause consul to have issues, specify which to bind to
if [ "${IP_ADDR:-0}" != "0" ]; then
cat << EOF | tee /etc/consul/bind.json
{
  "bind_addr": "${IP_ADDR}"
}
EOF
fi

Would to the trick