Fix forestdb iterator option

Need to use ITR_NO_DELETES, otherwise deleted entries also show up

Change-Id: Ibf616b664dcb2e63c032fcaf30bde198adc5743d
Reviewed-on: http://review.couchbase.org/43549
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Tested-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>