Bug 33987: Combine multiple db updates one in BatchCommitRecords

Bug 33987: Combine multiple db updates one in BatchCommitRecords

When replacing existing records BatchCommitRecords will the table import_records will be updated three times for three different fields by three different queries. Not only is this inefficient ( especially for large batches ), it seems that this is causing the dreaded "Lock wait timeout exceeded; try restarting transaction" error on some mysql/mariadb configurations.

1) Test plan
2) Download a marc record from Koha
3) Modify the title of that same bib in Koha
4) Stage the downloaded record and overlay the existing record
5) Verify the title has reverted to the original title from the
   downloaded record!

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>