Fail Over Additional Script Feature Request

[Mohamed-Emara77]

Request an implementation for a fail over script
the reason for that is to control cloud floating public ip addresses

for example

`export DO_TOKEN='digitalocean_api_token'
IP='reserved_ip_addr'
ID=$(curl -s http://169.254.169.254/metadata/v1/id)
HAS_RESERVED_IP=$(curl -s http://169.254.169.254/metadata/v1/reserved_ip/ipv4/active)

if [ $HAS_RESERVED_IP = "false" ]; then
n=0
while [ $n -lt 10 ]
do
python /usr/local/bin/assign-ip $IP $ID && break
n=$((n+1))
sleep 3
done
fi`

this will be the same as having a keepalived script as mentioned in this docs

https://www.digitalocean.com/community/tutorials/how-to-set-up-highly-available-web-servers-with-keepalived-and-reserved-ips-on-ubuntu-14-04#collecting-the-private-ip-addresses-of-your-servers