Bug 33671: (follow-up) Disable FK check for column change

Bug 33671: (follow-up) Disable FK check for column change

See also BZ report. As suggested by Tomas.

NOTE: The dbrev is extended too for removing records with a failing guarantor_id
foreign key (theoretically not present obviously).

Test plan:
1) cp installer/data/mysql/db_revs/220600048.pl installer/data/mysql/atomicupdate/
2) Run updatedatabase.pl
3) Remove copied file

Bonus:
Manually remove FK constraint before running updatedatabase.
Insert a record with bad guarantor_id into relationships manually.
Run the update again.
You should not see the message that the constraint is removed.
Is the bad record count reported and record removed?

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
[EDIT] Simplified. No longer removes the FK. Just disables during ALTER.
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 0397251ece455801d5b3083feb84cf959cfcea83)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 4cdb3a57db739c8b5ad672444b02b333ef914762)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>