Azure MFA support for RADIUS clients

Seems we have one less reason to keep the MFA server on-prem - meet the NPS Extension for Azure MFA. It allows your RADIUS clients to be enforced with Azure MFA. Details here: https://blogs.technet.microsoft.com/enterprisemobility/2017/02/06/azure-ad-news-azure-mfa-cloud-based-protection-for-on-premises-vpns-is-now-in-public-preview/

And the documentation: https://docs.microsoft.com/en-us/azure/multi-factor-authentication/multi-factor-authentication-nps-extension