[docs] Ops guide network planning should be improved

[Bogdan Dobrelya]

This comes from https://bugs.launchpad.net/mos/+bug/1447619/comments/7

The documentation should recommend users to plan the networking capacity carefully, which is:
* either to put management and private (i.e. tenant) tagged/GRE networks at different physical interfaces
* or configure QoS/management traffic prioritization for a single bond interface case.

[Dmitry Borodaenko (angdraug)]

Medium priority bugs are not backported to old releases, postponed to 7.0, marked Won't Fix for 6.0.x.

[Mike Scherbakov (mihgen)]

Raised to High priority as it affects all deployments including 6.1. Users must be aware of technical limitations of GRE in current Fuel reference architecture, otherwise it would lead to broken operations OpenStack (user won't be able to create / shutdown VMs / attach volumes /etc.).

We would also need to document a manual workaround: how to transfer GRE traffic to other physical interface.

[Bogdan Dobrelya (bogdando)]

Updated the description as we have the GRE traffic layout bug fixed https://bugs.launchpad.net/fuel/+bug/1285059

[Alexey Stupnikov (astupnikov)]

MOS6.0 is no longer supported, moving to Won't Fix.