qa_crowbarsetup: use HA with cloud3+
mkcloud: move mac address computation
qa_crowbarsetup: more flexible proposal handling
mkcloud: add support for hacloud

use it via
  export hacloud=1

Quick start quide:
You need at least 7, better 9 (for quorum), nodes.
Set the nodenumber accordingly:
  export nodenumber=10
And set desired minimum number of computenodes:
  export nodenumbercompute=1
This example will lead to the following setup:
 1 2-node data cluster (drbd)
 2 3-node clusters (services, network)
 2 compute nodes (unused node is used as compute node)