Bug 28417: (follow-up) Fix typo

- There are CAS demo servers, pick one [1]
- They all seem to have the same user/pass as of writing this:
  User: casuser
  Password: Mellon

To test:
1. Enable CAS and all related preferences. I chose v3 or higher, it only affects the logout action.
2. Set the CAS URL: https://casserver.herokuapp.com/cas (note that if you click on any of the examples, they include a trailing /login, don't put it).
3. Generate a Koha user, with userid: casuser (I also used that for cardnumber, just in case). Set no password to the user, or its irrelevant anyway. Add it stff permissions.
4. Open your Koha OPAC, I use KTD thus:
   http://kohadev.myDNSname.org:8080
5. Try to login using CAS
=> SUCCESS: You are redirected to the right login page
6. Login using casuser/Mellon as advertised in the 'demos' site.
=> SUCCESS: You are logged in!
7. Now logout
=> SUCCESS: You are sent to CAS so they know you wanted to logout (if you enabled CAS logout)
8. Repeat on the staff interface.
=> SUCCESS: Things work!
9. Apply this patches, restart all the things:
   $ restart_all
10. Repeat all in OPAC and admin interfaces
=> SUCCESS: Things work!
11. Sign off :-D

[1] https://apereo.github.io/cas/Demos.html

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

C4/Auth_with_cas.pm

@@ -33,7 +33,7 @@ our (@ISA, @EXPORT_OK);
 BEGIN {
     require Exporter;
     @ISA   = qw(Exporter);
-    @EXPORT_OK = qw(check_api_auth_cas checkpw_cas login_cas logout_cas login_cas_url logout_if_required multilpleAuth getMultipleAuth);
+    @EXPORT_OK = qw(check_api_auth_cas checkpw_cas login_cas logout_cas login_cas_url logout_if_required multipleAuth getMultipleAuth);
 }
 my $defaultcasserver;
 my $casservers;

opac/opac-user.pl

@@ -57,6 +57,7 @@ my $query = CGI->new;
 
 # CAS single logout handling
 # Will print header and exit
+require C4::Auth_with_cas;
 C4::Context->preference('casAuthentication') and C4::Auth_with_cas::logout_if_required($query);
 
 my ( $template, $borrowernumber, $cookie ) = get_template_and_user(