ldb: fixed callers for ldb_pack_data() and ldb_unpack_data()

ldb: fixed callers for ldb_pack_data() and ldb_unpack_data()

with ltdb_pack_data() and ltdb_unpack_data() now moved into common, we
need to increase the minor version and fixup callers of the API

Note that this relies on struct ldb_val being the same shape as
TDB_DATA, in much the same way as we rely on ldb_val and DATA_BLOB
being the same shape.

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>