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)
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