Add rack information for new elasticsearch nodes

Also, remove fail() out of case selector.  Having it there causes
  Function 'fail' does not return a value
from puppet, instead of actually showing the fail messages.
See: https://tickets.puppetlabs.com/browse/PUP-1457

Change-Id: I063828239576bf0bcac3d5d8aed7a21be25c24d4