lmdb: follow mdb_dump to ITS#8181.
lmdb: follow mdb_dump to ITS#8181.

Update mdb_dump corresponding to I5ebce36694045279702c74490a5a634217d4f95d.

Change-Id: I813bb6b4eedd9aba6f79b9c566331a1c053b53a2

leo-yuriev/libfpta,leo-yuriev/libfpta