Updated varnish packages fix CVE-2013-4484 and correct service behaviour

Updated varnish packages fix security vulnerabilities: Varnish before 3.0.5 allows remote attackers to cause a denial of service (child-process crash and temporary caching outage) via a GET request with trailing whitespace characters and no URI (CVE-2013-4484). Also, the services have been converted from SysV init scripts to systemd- native services, which should allow for more consistent behavior.