fix: 🐛 remove old CRDs using traefik.containo.us

[mloiseleur]

What does this PR do?

Remove old CRDs using traefik.containo.us.

Motivation

Fixes #895

[HeyHugo]

Bumped into this and couldn't understand why I couldn't list traefik CRD resources after I had upgraded.

To anyone having the same problem delete the legacy crds

kubectl get crd | grep 'traefik.containo.us' | awk '{ print $1 }' | xargs kubectl delete crd

Then get a crd resource explicitly using the full crd name like this
kubectl get ingressroute.traefik.io --all-namespaces

For me it seems some client state wasn't updated until I did. After that using just kubectl get ingressroute worked

[darkweaver87]

LGTM

[davidpanic]

This was reverted in bf75a5d Can anyone provide any information as to why?

[mloiseleur]

It's detailed in the PR:

• revert: "fix: 🐛 remove old CRDs using traefik.containo.us" #944