Config changes for Elasticsearch

1. Set up rack/row attributes but do not turn on awareness (yet)
2. Set the expected nodes correctly for the cluster size
3. Add elastic1013 as a ganglia aggregator.

Number 1 is kind of cool because Elasticsearch will actually try to fulfill
searches in the same rack/row if possible.  We'll turn on cluster row
awareness after 1.0 is settled.

Change-Id: I899ab89443c39a6b24e38e2899feb86a26201022