Merge branch '6214-failed-to-restart-clamd-amavisd-service-unit-clamd-amavisd-service-not-found' into 'develop'

Resolve "Failed to restart clamd.amavisd.service: Unit clamd.amavisd.service not found."

Closes #6214

See merge request ispconfig/ispconfig3!1506

Author: Marius Burkard

install/dist/conf/fedora9.conf.php

@@ -154,7 +154,7 @@
 
 //* ClamAV
 $conf['clamav']['installed'] = false; // will be detected automatically during installation
-$conf['clamav']['init_script'] = 'clamd.amavisd';
+$conf['clamav']['init_script'] = 'clamd@amavisd';
 
 //* Pureftpd
 $conf['pureftpd']['installed'] = false; // will be detected automatically during installation