H2O: Increase the maximum number of connections accepted simultaneously (#2668)

Previously, the maximum number of connections accepted simultaneously was 1
in order to improve load balancing. Now the SO_REUSEPORT socket option takes
care of that, so the number can be increased to reduce the amount of system
calls.

frameworks/C/h2o/setup.sh

@@ -35,7 +35,7 @@ run_curl()
 
 run_h2o_app()
 {
-	"$1/h2o_app" -a1 -f "$2/template/fortunes.mustache" -m "$DB_CONN" "$3" "$4" \
+	"$1/h2o_app" -f "$2/template/fortunes.mustache" -m "$DB_CONN" "$3" "$4" \
 		-d "host=TFB-database dbname=hello_world user=benchmarkdbuser password=benchmarkdbpass" &
 }