Bug 9971 - Plugins system is broken!

Trying to run a plugin results in the following error:

Software error:

Undefined subroutine &Koha::Plugins::Base::get_template_and_user called
at /home/koha/kohaclone/Koha/Plugins/Base.pm line 108.

The is caused by the change from 'use C4::Auth' to 'require C4::Auth'
which does not export get_template_and_user.

Test Plan:
1) Install the KitchenSink plugin
2) Try to run the report, tool or configuration for the plugin
3) Note the error
4) Apply the patch
5) Try again

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>

Koha/Plugins/Base.pm

@@ -105,12 +105,11 @@ sub get_template {
 
     require C4::Auth;
 
-    my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
+    my ( $template, $loggedinuser, $cookie ) = C4::Auth::get_template_and_user(
         {   template_name   => $self->mbf_path( $args->{'file'} ),
             query           => $self->{'cgi'},
             type            => "intranet",
             authnotrequired => 1,
-#           flagsrequired   => { tools => '*' },
             is_plugin       => 1,
         }
     );