Comment 4 for bug 1563749

The way we start master-node setup: we attach iso to vm, start it, and blindfolded waiting 3 sec before pressing <Esc> key in grub menu and type kernel params to start auto-install.
So one of real causes of this bug is overload of server. In this case after 3 seconds after we sent command to start vm, vm is not show grub menu on the screen. Then vm receive and ignore kernel params and react only to <Enter> key which start setup with default parameters.

This is very rare coincidence, but we can fix this in two ways:
1. Watch that server has free resources
2. Refactor fuel-qa and start master node directly send parameters via libvirt (but in this case we will not test ISO boot menu)

As for now I can't reproduce this bug, but assume it real.