Switch the two gateload machine because the first one is not pingable

Change-Id: I922b7853a10757caa6adda5bc4a6e8a6323d4eaa
Reviewed-on: http://review.couchbase.org/37844
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Li Yang <lichenyang2@gmail.com>