Changed rpm summary string as requested by the Fedora project

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3463 d4fa192b-c00b-0410-8231-f00ffab90ce4

redhat/varnish.spec

-Summary: Varnish is a high-performance HTTP accelerator
+Summary: High-performance HTTP accelerator
 Name: varnish
 Version: 2.0.2
 Release: 1%{?dist}