Update etcd version to v3.1.9.
"importpath": "github.com/coreos/etcd",
"repository": "https://github.com/coreos/etcd",
"vcs": "git",
- "revision": "8ba2897a21e4fc51b298ca553d251318425f93ae",
+ "revision": "0f4a535c2fb7a2920e13e2e19b9eaf6b2e9285e5",
"branch": "HEAD",
"notests": true
},
