Yes, I did....
But I found that apache2 overwrites the httpd.conf file every time it is restartet.... So the Directory tag is overwritten....
Where do I put this tag in zentyal webserver?
<Directory /var/www/bugzilla>
AddHandler cgi-script .cgi
Options +ExecCGI
DirectoryIndex index.cgi index.html
AllowOverride Limit FileInfo Indexes Options
</Directory>