use `cidr-tools` to validate gateway is inRange

[Omarabdul3ziz]

Changes

• add validation on the gateway to make sure it is in the range of the provided ips.
• add cidr-tools package

Related issues

• https://github.com/threefoldtech/tfgrid_dashboard/issues/444

[Mahmoud-Emad]

Based on testing, the issue is still there.

I tried a valid IP and it accepted and created

but it should accept only public IP, it should tell me that this is not a pub ip

and if I submit it, it fails.

[Omarabdul3ziz]

Actually 192.167.. is a valid public ip from class C. as well 1.1.1.1 from class A

The reserved Ips for private networks is

• Class A: 10.0.0.0 to 10.255.255.255
• Class B: 172.16.0.0 to 172.31.255.255
• Class C: 192.168.0.0 to 192.168.255.255

i tried it and it worked

and the validation looks working on the out range IPs

Can you re test it please?