k3s - add params for kubectl logs to work

[backstreetkiwi]

While (integration)testing the task stackabletech/agent#37, @siegfriedweber noticed that the k3s installation on the clusters provisioned by T2 is missing some params that should be set at startup:

--kube-controller-manager-arg cluster-signing-cert-file= \ --kube-controller-manager-arg cluster-signing-key-file= \ --kube-controller-manager-arg cluster-signing-kube-apiserver-client-cert-file=/var/lib/rancher/k3s/server/tls/client-ca.crt \ --kube-controller-manager-arg cluster-signing-kube-apiserver-client-key-file=/var/lib/rancher/k3s/server/tls/client-ca.key \ --kube-controller-manager-arg cluster-signing-kubelet-client-cert-file=/var/lib/rancher/k3s/server/tls/client-ca.crt \ --kube-controller-manager-arg cluster-signing-kubelet-client-key-file=/var/lib/rancher/k3s/server/tls/client-ca.key \ --kube-controller-manager-arg cluster-signing-kubelet-serving-cert-file=/var/lib/rancher/k3s/server/tls/server-ca.crt \ --kube-controller-manager-arg cluster-signing-kubelet-serving-key-file=/var/lib/rancher/k3s/server/tls/server-ca.key