Change default VM size to 2 CPU cores at least in azure portal of creating AKS cluster page

[andyzhangx]

What happened:
As I could see in azure portal, when creating an AKS cluster, the default VM size is Standard DS1 v2 (1 vcpus, 3.5 GB memory), actually according to my investigation, VM size with 1 core would have issue, the system is very slow, could you change default VM size to 2 CPU cores at least, e.g. Standard D2s v3 (2 vcpus, 8 GB memory)

Moreover, I think we should remove all VM size with 1 CPU core in AKS support list.

@slack

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
• Size of cluster (how many worker nodes are in the cluster?)
• General description of workloads in the cluster (e.g. HTTP microservices, Java app, Ruby on Rails, machine learning, etc.)
• Others:

[AaronFriel]

I don't think 1-cpu nodes should be forbidden, it's easy to imagine they could be useful as a non-primary node pool.

[zqingqing1]

Can you put your suggestion in the voice link [https://feedback.azure.com/forums/914020-azure-kubernetes-service-aks] to see how people is thinking about this? If it is needed by most of people, we can definitely implement this.