Fix cri-config-ensurer and registry images

[ialidzhikov]

How to categorize this PR?

/area quality
/kind regression
/kind bug

What this PR does / why we need it:
Currently the cri-config-ensurer has the following code for the image:

gardener-extension-registry-cache/pkg/controller/criensurerdeployer.go

Line 134 in 0ef3e17

Image: c.CRIEnsurerImage.String(),

Note that it uses only the repository and ignores any tag.

This results in the Pod to be created such as:

  containers:
  - name: name: cri-config-ensurer
    image: eu.gcr.io/gardener-project/3rd/bash

After #17, the repo is switched to eu.gcr.io/gardener-project/3rd/bash and the latest tag does no longer exists. Hence, currently the cri-config-ensurer cannot be pulled at all:

% k -n registry-cache get po
NAME                       READY   STATUS             RESTARTS   AGE
cri-config-ensurer-xs7l6   0/1     ImagePullBackOff   0          43m

  Warning  Failed     13m (x3 over 14m)     kubelet            Failed to pull image "eu.gcr.io/gardener-project/3rd/bash": rpc error: code = NotFound desc = failed to pull and unpack image "eu.gcr.io/gardener-project/3rd/bash:latest": failed to resolve reference "eu.gcr.io/gardener-project/3rd/bash:latest": eu.gcr.io/gardener-project/3rd/bash:latest: not found

The same applies for the registry image:

  Warning  Failed            6s                   kubelet            Failed to pull image "eu.gcr.io/gardener-project/3rd/registry": rpc error: code = NotFound desc = failed to pull and unpack image "eu.gcr.io/gardener-project/3rd/registry:latest": failed to resolve reference "eu.gcr.io/gardener-project/3rd/registry:latest": eu.gcr.io/gardener-project/3rd/registry:latest: not found

Which issue(s) this PR fixes:
N/A

Special notes for your reviewer:
N/A

Release note:

NONE

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: timebertt

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[gardener-prow]

LGTM label has been added.

Git tree hash: 9daeb9cc6a914fce8d5c0a2d01680c51a2b9954e