CBQE-927: extend offline_cluster_upgrade_non_default_path

Change-Id: I1cbfae0e06a1641cec77cbd82271cf7a595993d0
Reviewed-on: http://review.couchbase.org/23650
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>