[DRBD-user] linstor-proxmox controller toggle tests

[Greb]

Thanks for the advice Yannis, I actually saw the method to create a 
controller vm. But it seems to me to have understood also that the 
operation with only 2 nodes drbd is possible; that's exactly what I want 
to test.
So the quorum should be changed ?
I'm perhaps a little too nostalgic but I wanted to find a mode of 
operation with only 2 nodes a bit as we have known with drbd 8 / proxmox 
3 which was very successful.
I do not think I'm the only one exploring this path...

Greb