CBQE-1183 add cluster ips to testcfg.py to initialize cluster status obj

Also for the update cluster status task, we support multiple
cluster status obj updating

Change-Id: I00ca5dddc51f7bc60523be442da7de2e9209645d
Reviewed-on: http://review.couchbase.org/25626
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: buildbot <build@couchbase.com>