Whitespace cleanup
Fix error for repeated symbolic title alias

Puppet auto add alias from the symbolic title, but this has to be
unique.

This fixes the error:

  err: Failed to apply catalog: Parameter alias failed:
  1_node-1_compute-nodes can not create alias Compute-nodes: object
  already exists

raised by Puppet::Type:newmetaparam(:alias)

Why the nodes are added multiple times?  Still unknown at this point.
Merge pull request #2 from dancn/fix-alias

Fix alias