Do not set Connection: keep-alive unless -enable_keep_alive is set

test/test.pl

@@ -229,6 +229,7 @@ o("GET /$test_dir_uri/x/ HTTP/1.0\n\n",
   "SCRIPT_FILENAME=test/test_dir/x/index.cgi", 'SCRIPT_FILENAME');
 o("GET /ta/x/ HTTP/1.0\n\n", "SCRIPT_NAME=/ta/x/index.cgi",
   'Aliases SCRIPT_NAME');
+o("GET /hello.txt HTTP/1.1\n\n", 'Connection: close', 'No keep-alive');
 #o("GET /hello.txt HTTP/1.1\n\n   GET /hello.txt HTTP/1.0\n\n",
 #  'HTTP/1.1 200.+keep-alive.+HTTP/1.1 200.+close',
 #  'Request pipelining', 2);