Switch the test machines because the first test machine 172.23.96.63 seems to have problem

Change-Id: I569e5345cd3ed71503af42c251bd80fbf26355af
Reviewed-on: http://review.couchbase.org/37265
Reviewed-by: Li Yang <lichenyang2@gmail.com>
Tested-by: buildbot <build@couchbase.com>