fix: ssh keypair names should include realm and cluster name

Squashed commit of the following:

commit cef6df75ee50f5c8be7ea763b8938e069633867a
Author: Chris Howe <howech@infochimps.com>
Date:   Wed Mar 19 11:55:15 2014 -0500

    Added a full_cluster_name method that includes the realm name and the cluster name

    Change-Id: Ifbf8c184090d2d809ca3850803d0d7cdc6ff96d8

Change-Id: I6621ed898f867a5388409da6da1856d16bad2c76