The behavior of the container defaulting in attach/exec is inconsistent
and should be unified. As a user, when we default the vast majority of
pods will have a small number of containers and so printing the container
names inline (as kubectl logs did) is more appropriate. The debug message
we printed about using describe was already longer than 99% of all pod
container names, so we were wasting user time.
Unify container selection for exec and attach to be consistent with old
behavior. Properly handle the --quiet flag (should not print in that case)
for both commands. Remove EnableCmdSuggestion and the machinery it needs.
The message now prints:
> Defaulted container "etcdctl" out of: etcdctl, etcd, etcd-metrics, etcd-ensure-env-vars (init), etcd-resources-copy (init)
Kubernetes-commit: 43e8ebbbcd3f57d18d8151efb6242f88a763b06d
56434236a4