Bug 14034: Fix logout on refresh for shibboleth

Bug 14034: Fix logout on refresh for shibboleth

This is similar to bug 12877

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
While this is missing a detailed test plan, what I did to test was

1/ Login to koha .. it works
2/ Apply patch
3/ Login to koha .. it still works, no regressions. I can't test the
shibboleth part but it doesnt break anything else so I'm happy to sign
off

Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>
We had to implement this fix for one of our customers using Shibboleth.
Can verify that it fixes the issue (which, incidentally, breaks
stage-marc-import since that depends on a constant sessionID).

Passing QA (verified with QA tools). Thanks, Martin!

Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com