Add docker secret Docker 1.13+

[khs1994]

• Have u googled the problem? If no, pls do that first!

Environment

• Linux
  • CentOS 7
  • Ubuntu 16.04
  • Ubuntu 17.10
  • CoreOS
  • Debian 8
  • Debian 9
• macOS
• Windows 10
• Raspberry Pi (ARM)
• Others (Pls describe below)

Docker Version

• 17.11 Edge
• 17.09 Stable
• 1.13.0
• Before 1.13.0

Problem Description

https://docs.docker.com/engine/swarm/secrets/