Define CloudHugger netmask

Summary:
Seems to be a /24, as OVH used .254 gateways for /24 IP ranges.

Ref T1832

Test Plan: salt cloudhugger node.resolve_network

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1832

Differential Revision: https://devcentral.nasqueron.org/D3006