Bug 29474: Return too_soon before checking renewals

Bug 29474: Return too_soon before checking renewals

This patch allows us to avoid checking reserves when the issue is
too_soon and we are running the cron

Code is covered by existing tests

To test:
1 - prove -v t/db_dependent/Circulation.t

Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>