build, cmd/stdiscosrv, cmd/strelaysrv: Rename binaries to add "st" prefix

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3371

cmd/strelaysrv/utils.go

@@ -0,0 +1,28 @@
+// Copyright (C) 2015 Audrius Butkevicius and Contributors.
+
+package main
+
+import (
+	"errors"
+	"net"
+)
+
+func setTCPOptions(conn net.Conn) error {
+	tcpConn, ok := conn.(*net.TCPConn)
+	if !ok {
+		return errors.New("Not a TCP connection")
+	}
+	if err := tcpConn.SetLinger(0); err != nil {
+		return err
+	}
+	if err := tcpConn.SetNoDelay(true); err != nil {
+		return err
+	}
+	if err := tcpConn.SetKeepAlivePeriod(networkTimeout); err != nil {
+		return err
+	}
+	if err := tcpConn.SetKeepAlive(true); err != nil {
+		return err
+	}
+	return nil
+}