simplify cert-manager install with 'kubectl wait',

[JayKayy]

Summary

In place of the cm-verifier, we take advantage of the kubectl wait command to wait for the 3 deployments of cert-manager to become available.

This PR does the following:

• removes the dependency on cert-manager-verifier.
• simplifies the logic of the install-cert-manager.sh
• makes install-cert-manager.sh agnostic of OS/architectures, as it just uses kubectl.

Testing

make kind-create
make certmanager-install

Verify that the output looks like this:

...
deployment.apps/cert-manager-webhook created
mutatingwebhookconfiguration.admissionregistration.k8s.io/cert-manager-webhook configured
validatingwebhookconfiguration.admissionregistration.k8s.io/cert-manager-webhook configured
deployment.apps/cert-manager-cainjector condition met
deployment.apps/cert-manager-webhook condition met
deployment.apps/cert-manager condition met

-> kubectl get pods -A # verify the pods are in fact up and Running
...
cert-manager         cert-manager-c9d79589f-r7lbg                 1/1     Running   0          10s
cert-manager         cert-manager-cainjector-597db8dbc-f95k8      1/1     Running   0          10s
cert-manager         cert-manager-webhook-cc66556ff-fvsdq         1/1     Running   0          10s

Additional Notes

kubectl wait is in an experimental state,

[CLAassistant]

All committers have signed the CLA.