packaging: Updated fkvalidator SP to drop function before recreating

This package updates the fkvalidator_sp with drop
function call, so that this stored procedure can be loaded
into older databases (the signature of the function changed,
so it cannot be overwritten, only recreated).

Change-Id: Ic20625ed61caf8f1aaff4860c18f048402b32353
Signed-off-by: Alex Lourie <alourie@redhat.com>