Add ability to make cluster objects to test harness.
Add ability to make cluster objects to test harness.

Change-Id: Ie84f4f6d2a3fee92061c85049998ea49f71fd20e
Reviewed-on: http://review.couchbase.org/115738
Reviewed-by: David Nault <200f347e2e70673aef8c2cefe9173798334cd48c@couchbase.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/couchnode,couchbase/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,brett19/couchnode,couchbase/couchnode