Subnet retrieval should be more flexible

[johnlanni]

Hi, when I enable the Calico CNI in k8s , the subnet of the pods’ IPs can’t be obtained by telepresence exactly. I found some information about the Pod’s CIDR and Calico:

https://docs.projectcalico.org/networking/get-started-ip-addresses
projectcalico/calico#2592 (comment)

It seems we must enable the Host-local IPAM, then Calico will use the Node.Spec.PodCIDR for pod.
I think the logic of Deriving subnets from IPs of pods should be configureable, then we no need to enable the Host-local IPAM plugin.

Or check whether Calico is deployed in the cluster, and obtain the CIDR from Calico’s blockaffinities, then adding to the pods' CIDRs.

[efunk]

Resolved in Telepresence 2.4.4 GA