Attach floating IP to a VM in Elektra should filter out all clearly wrong FIPs

[kayrus]

A VM can have multiple interfaces, each interface can have its own set of FIPs to be assigned to avoid an error above.

Elektra should check available "port-FIP'-pairs in advance before putting them into the "Attach FIP" dropdown to avoid such messages.

Here is a script, which can list valid FIPs per each server's interface:

#!/bin/bash

os=openstack
server_id=$1
for port in `$os port list --device-id $server_id -f value -c id`; do
  for subnet_id in `$os port show $port -f json -c fixed_ips | jq -r '.fixed_ips[]|.subnet_id'`; do
    for router_port in `$os port list --fixed-ip subnet=$subnet_id --device-owner network:router_interface -f value -c id`; do
      router_id=$($os port show $router_port -f value -c device_id)
      for router_fip_subnet in `$os router show $router_id -f json -c external_gateway_info | jq -r '.external_gateway_info.external_fixed_ips[]|.subnet_id'`; do
        router_fip_network=$($os subnet show $router_fip_subnet -f value -c network_id)
        echo "The $server_id server's $port port can have the following FIPs:"
        $os floating ip list --network $router_fip_network -f json | jq -r '.[]|select(."Fixed IP Address"==null)|."Floating IP Address"'
      done
    done
  done
done