Docs: Install guide: Testing reqs/network equip config

[Michele Fagan]

In the Fuel Installation Guide please update Fuel Master node hardware requirements:

For a testing environment:

Dual-core CPU
2 GB RAM
1 gigabit network port
50 GB disk
Physical console
*50 GB is not enough - for testing we usually use 75 GB disk *

2. There is no information about configuration of network equipment in sections:

Nova-network VLAN Manager
Neutron with VLAN segmentation
Ports should be not only tagged, very often corresponding tags should be allowed in addition on the network equipment.

3. Section "Configure a network interface for the Fuel web UI"
What is the purpose of this section?
Maybe it would be better to call it "Configure additional network interface for the Fuel web UI" and why we should enable only dhcp?

4. There is also no notification that ssh console can be reached only from admin network. It maybe added to section "Log in to the Fuel Master node with multiple NICs"

5. 8443 should be added to 22 and 8000 on the last line of hardware checklist