Tune dump program a bit

Change-Id: I9097cf8246dcef5138f3c9a49fe17bbb15d5a23d
Reviewed-on: http://review.couchbase.org/25914
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>