CBQE-1291: online upgrade kv spec

Does online upgrade + post upgrade kv access
Uses new ssh tag to upgrade 5 nodes

Change-Id: I227c52e953719800d14ab1ca25077afbf50ac372
Reviewed-on: http://review.couchbase.org/26844
Tested-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>