Remove vendoring from addon-resizer; update Go version

[bboreham]

Vendor dir should be removed similar to #7572.

From the Makefile, it is currently using Go 1.12.1, which is quite old and not receiving security patches.
Unwisely pulling on the thread, it also uses godep, archived in 2019.

I was going to make a PR, but the plethora of issues made me wonder. So I'm filing this issue instead to see if there is some context I'm missing.

[raywainman]

For a variety of reasons the addon-resizer is being developed and built on the following branch: https://github.com/kubernetes/autoscaler/tree/addon-resizer-release-1.8

This branch is getting security updates.

However, we should probably follow-suit with the removal of the vendor directory here as well.

[raywainman]

/area addon-resizer

[bboreham]

Thanks, I was indeed missing that context.

[adrianmoisey]

For a variety of reasons the addon-resizer is being developed and built on the following branch: https://github.com/kubernetes/autoscaler/tree/addon-resizer-release-1.8

This branch is getting security updates.

However, we should probably follow-suit with the removal of the vendor directory here as well.

Any reason to not bring that development back to the default branch?

[raywainman]

I don't know the full history here... GKE still uses the 1.8 branch which is why most of the action for Google happens there.

There was a big change as part of 2.0 that I don't believe has been adopted yet.

[adrianmoisey]

Ah interesting. As per usual there's always some history to these things