Add NSG Rule activity log alert alerts to portal
Background: Currently, the only way to create a NSG rule activity log alert is through ARM templates. The documentation provided with the Unified Alerts public preview made it ambiguous that NSGs but NOT NSG rules were able to be created in the portal. Otherwise the new Unified Alerts is pretty awesome :)
Proposed Action: 1) Create an option in the Alerts blade for NSG Rule alerts to be created. 2) Update documentation to be more explicit in differentiating NSGs/NSG rules in activity log alerts.