Bug 22607: Change default value in issues.renewals to '0'.

Bug 22607: Change default value in issues.renewals to '0'.

This patch change renewals column of issues and old_issues tables.

Now it is NOT NULL default 0. It does not make sense when number of
renewals is undefined, it is always integer with value zero or more

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit cf95f0a7e6897d3dc4b90c92ffad19230379d7cb)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit fd22ef99fe0d78bce28d659323bd8401067f198b)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>