Make Grace mode the default with 10 seconds (param: default_grace)

Make the thread idle timeout 300 seconds (param: thread_pool_timeout)

Max one new thread per 20 msec (param: thread_pool_add_delay)



git-svn-id: http://www.varnish-cache.org/svn/trunk@2665 d4fa192b-c00b-0410-8231-f00ffab90ce4