Comment 0 for bug 1503675

All the gaps listed below are about https://docs.mirantis.com/openstack/fuel/fuel-7.0/reference-architecture.html#ref-arch:

- looks like there is no reference diagram for a pure-KVM deployment without vSphere - please, clarify if this is really so; if pure-KVM is presupposed to be there, add the corresponding note

- “Example of network topology” section+ “Fuel running under vSphere” should demonstrate very clear picture about Fuel Admin(PXE) that actually doesn't need to have access to the internet to download packages

- it's required to clarify the following issue: how the net access is configured at the Fuel Master node? when should the gateway configuration happen - at which stage?