Renewals were being rejected for incorrect reasons
Checking was being done against the wrong object
Add more informative messages on failure
Correctly set due_date for renewal response
Avoid crashing the SIPServer because it handles RenewAll
incorrectly
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz> Signed-off-by: Paul Poulain <paul.poulain@biblibre.com> Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>