remove rkt and kubelet-wrapper from kubernetes tests

[tormath1]

in this PR, we remove the usage of rkt runtime and the kubelet-wrapper in order to prepare the removal of this components from the OS.

Testing done

It could run on QEMU but I have some memory issues. Tests have been done on GCP using alpha-2823.0.0:

./bin/kola run --basename=${BASENAME} \
    --gce-image=${IMAGE_NAME} \
    --gce-json-key=${GCE_JSON_KEY} \
    --parallel=4 --platform=gce \
    -d -k --remove=false \
    ${TEST_NAME}
2021-04-22T12:30:43Z cli: Started logging at level DEBUG
=== RUN   google.kubernetes.basic.docker.v1.18.0
2021-04-22T12:30:43Z kola/tests/kubernetes: Creating single-node etcd
2021-04-22T12:30:43Z platform/api/gcloud: Creating instance "tormath1-tests-rkt-68160e03b7993c51b9a5"
2021-04-22T12:31:05Z platform/api/gcloud: Created instance "tormath1-tests-rkt-68160e03b7993c51b9a5"
2021-04-22T12:31:56Z kola/tests/etcd: cluster healthy
2021-04-22T12:31:56Z kola/tests/kubernetes: Creating master node
2021-04-22T12:31:56Z platform/api/gcloud: Creating instance "tormath1-tests-rkt-b05d2e43908d6d471a3c"
2021-04-22T12:32:19Z platform/api/gcloud: Created instance "tormath1-tests-rkt-b05d2e43908d6d471a3c"
2021-04-22T12:32:54Z kola/tests/kubernetes: Generating TLS assets on the master
2021-04-22T12:33:24Z kola/tests/kubernetes: Creating worker nodes
2021-04-22T12:33:24Z platform/api/gcloud: Creating instance "tormath1-tests-rkt-c1a62bcae178faafba56"
2021-04-22T12:33:37Z platform/api/gcloud: Created instance "tormath1-tests-rkt-c1a62bcae178faafba56"
2021-04-22T12:34:17Z kola/tests/kubernetes: Generating TLS assets on the workers
2021-04-22T12:34:45Z kola/tests/kubernetes: Configuring nodes by running the install scripts
2021-04-22T12:36:00Z kola/tests/kubernetes: Configuring kubectl on the master
2021-04-22T12:36:10Z kola/tests/kubernetes: Waiting for all nodes to appear on kubectl
--- PASS: google.kubernetes.basic.docker.v1.18.0 (400.16s)