[18.09 backport] Vendor Libnetwork c902989

[mavenugo]

This commit brings in moby/libnetwork#2356 and moby/libnetwork#2357. Adds a workaround for a WS2016 HNS race issue by serializing the L2 Table programming across networks.

Signed-off-by: Madhu Venugopal madhu@docker.com

- What I did

- How I did it

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

LGTM

[selansen]

Below is failed error case, I dont think its related but mentioning it here
FAIL: docker_cli_run_test.go:1791: DockerSuite.TestRunInteractiveWithRestartPolicy

17:53:32 assertion failed: 
17:53:32 Command:  /usr/local/cli/docker run -i --name test-inter-restart --restart=always busybox sh
17:53:32 ExitCode: 0
17:53:32 Error:    <nil>
17:53:32 Stdout:   
17:53:32 Stderr:   
17:53:32 
17:53:32 Failures:
17:53:32 ExitCode was 0 expected 11
17:53:33 ```

[selansen]

LGTM

[thaJeztah]

I see that one was flaky a few times in the past; https://github.com/moby/moby/search?q=TestRunInteractiveWithRestartPolicy&type=Issues

Let me restart CI