Bug 35442: Script migration_tools/build_oai_sets.pl add ORDER BY

Bug 35442: Script migration_tools/build_oai_sets.pl add ORDER BY

Script migration_tools/build_oai_sets.pl is missing ORDER BY
biblionumber.
This is a problem when using OFFSET and LIMIT, the results may be
differenly orderder between two calls of this script.

Test plan :
1) Create a OAI SET with all records
2) Run migration_tools/build_oai_sets.pl with the first half of records
3) Run migration_tools/build_oai_sets.pl with the second half of records
4) Check all records are in the OAI set

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>