Tests/regression-satellite: fix permission denied error in cleanup()

The cleanup() function cats the httpd log and error file, but did not
use sudo, which failed on permissions. Fix that.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

test/cases/regression-composer-works-behind-satellite-fallback.sh

@@ -83,8 +83,8 @@ function cleanup {
     set +eu
 
     greenprint "Display httpd logs"
-    cat /var/log/httpd/access_log
-    cat /var/log/httpd/error_log
+    sudo cat /var/log/httpd/access_log
+    sudo cat /var/log/httpd/error_log
 
     greenprint "Putting things back to their previous configuration"