add test case used to test iterator bug MB-16644
add test case used to test iterator bug MB-16644

Change-Id: Iff5fcf855b3bdcb46b5d2cdbd3b13d2153ac9b92
Reviewed-on: http://review.couchbase.org/56414
Reviewed-by: Marty Schoch <ba9951d7d66412e2a57aea395f01176a793cf5eb@gmail.com>
Tested-by: Marty Schoch <ba9951d7d66412e2a57aea395f01176a793cf5eb@gmail.com>

couchbase/goforestdb,couchbase/goforestdb