Set purge_hash to on by default in the 2.0 branch.

git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@3715 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/mgt_param.c

@@ -720,7 +720,7 @@ static const struct parspec input_parspec[] = {
 		"NB: this increases storage requirement per object "
 		"by the length of the hash string.\n",
 		MUST_RESTART,
-		"off", "bool" },
+		"on", "bool" },
 	{ "log_local_address", tweak_bool, &master.log_local_addr, 0, 0,
 		"Log the local address on the TCP connection in the "
 		"SessionOpen shared memory record.\n",