Add CNI to ecs-agent/netlib/model and update dependencies

[Realmonia]

Summary

This PR introduces CNI models from Fargate agent implementation to ecs-agent module. Later ecs agent will be integrate with those models.

Implementation details

Besides mentioned change, I also updated some dependency version to match Fargate's dependency versions. Notably:

• github.com/Microsoft/hcsshim from 0.8.25 to 0.9.9
• github.com/stretchr/testify from 1.7.0 to 1.8.1
• github.com/vishvananda/netlink from 1.1.1-0.20201029203352-d40f9887b852 to 1.2.1-beta.2
• golang.org/x/sys 0.6.0 to 0.7.0
• golang.org/x/tools 0.6.0 to 0.7.0

github.com/vishvananda/netlink upgrade to is a beta version but it has been out for a year and fargate is using it. And in our codebase, we are simply using LinkByName and LinkList methods that are not modified.

One dependency update we want to do but contains a breaking change is github.com/containernetworking/plugins. In the upgrade from 0.9.1 to 1.3.0, it now depends on containerd/cgroup 1.1.0, which contains a breaking change. It is later fixed in v3.0.2 (thanks @mythri-garaga and @singholt), but to integrate with that version we need to change non trivial code in agent. This will be done in a follow up PR.

Related links: #3623 containerd/cgroups#296

SetV2NDstPortAndDeviceName's function signature is changed. For Fargate to consume this, it needs to do data client operations before entering this function.

Also removed vpctunnel_linux_integ_test due to the different plugin path/setup in agent. For amazon-ecs-agent, currently integration test does not build CNI plugins, while Fargate does. These types of integration tests should be added when the code is actually integrated with agent.

Testing

New tests cover the changes: Yes. Added unit tests.

Note that - since the added changes are imported from Fargate agent, we do not build CNI plugins in unit/integ test; we can change this behavior (make the integ test builds cni plugins too), or move it to functional tests when we integrate with netlib but will call it out of scope for this PR. A list of missing/removed tests due to this limitation follows:

• func (c *cniClient) Version(plugin string) (string, error) test in client.go. Agent currently checks the VERSION value in git submodule instead of calling --version command using built plugin.
• func SetV2NDstPortAndDeviceName(taskENI *networkinterface.NetworkInterface, dstPort uint16) test in vpctunnel_config.go as mentioned in earlier section of this PR description.

Passed Github workflow.

Description for the changelog

Add CNI to ecs-agent/netlib/model and update dependencies

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.