Don't use System.out from tests

Change-Id: I9bda97d0262945d65cd6c66f0ba9ca179216a60c
Reviewed-on: http://review.couchbase.org/27705
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>