lib/ldb-samba: Align py_ldb_set_opaque_integer() with pyldb_set_opaque() and use...

lib/ldb-samba: Align py_ldb_set_opaque_integer() with pyldb_set_opaque() and use "unsigned long long"

We need to change the internal types assumed in Samba for the opaque
integers to "unsigned long long" as this is what ldb.set_opaque() will
create, and we want to move to this interface rather than have a
duplicate.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Jo Sutton <josutton@catalyst.net.nz>