Remove docker collector

[arnaud-tincelin]

No description provided.

[Tatsinnit]

💡 This PR is way more simpler and looks good : - ) , But needs folks to make a informed decision for this hence @rzhang628 , @palma21, @justindavies or @qpetraroia - please add some thoughts for this if you guys differ.

• Docker deprecation here : https://kubernetes.io/blog/2020/12/02/dont-panic-kubernetes-and-docker/
• Question for PMs: Does that mean that we need workitem for Containerd-log-collector ?

Thanks heaps,
^Tats

[Tatsinnit]

Ok, I am convinced this is no longer needed see below from latest default AKS cluster :

[Tatsinnit]

Docker is deprecated from Kubernetes 1.20 onwards. I have added the screenshot from a latest default cluster run.