CBQE-2047 Test add_nodes_with_ddoc_ops failing when trying to perform operation on node that's not in cluster

Change-Id: Ia04a1848b05a82946bd089c1f0c8a14d25289b63
Reviewed-on: http://review.couchbase.org/34769
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Reviewed-by: Meenakshi Goel <meenakshi.goel@globallogic.com>
Tested-by: Meenakshi Goel <meenakshi.goel@globallogic.com>