Bug 24199: (bug 23042 follow-up) Prevent t/Auth_with_shibboleth.t to fail randomly

Bug 24199: (bug 23042 follow-up) Prevent t/Auth_with_shibboleth.t to fail randomly

CGI->url_param does not always return the parameters in the same order.

Test plan:
0/ Recreate the random failure, does not apply the patch and run
t/Auth_with_shibboleth.t several times.
You will notice that it fails inconsistenly
1/ Apply the patch and confirm that it now passes 100% of the time

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit b022b37db75e468cc56f3189b2f284f03e81ca2d)
(cherry picked from commit 62875f2b40c2608ddc2447d2a72f89d225b7c88c)