Add handling of incorrect docker hub URLs

[scaps1]

Because of incorrect registry url of docker hub in imagePullSecret we receiving alerts that images are unavailable and 401 UNAUTHORIZED in app logs.
Example of incorrect creds:

{
  "auths": {
    "docker.io": {
      "username": "login",
      "password": "password",
      "auth": "auth_chain"
    }
  }
}

Correct way:

{
  "auths": {
    "https://index.docker.io/v1/": {
      "username": "login",
      "password": "pass",
      "auth": "chain"
    }
  }
}

[nabokihms]

There are two types of docker secrets. We have to cover both:

	// SecretTypeDockercfg contains a dockercfg file that follows the same format rules as ~/.dockercfg
	//
	// Required fields:
	// - Secret.Data[".dockercfg"] - a serialized ~/.dockercfg file
	SecretTypeDockercfg SecretType = "kubernetes.io/dockercfg"

	// DockerConfigKey is the key of the required data for SecretTypeDockercfg secrets
	DockerConfigKey = ".dockercfg"

	// SecretTypeDockerConfigJson contains a dockercfg file that follows the same format rules as ~/.docker/config.json
	//
	// Required fields:
	// - Secret.Data[".dockerconfigjson"] - a serialized ~/.docker/config.json file
	SecretTypeDockerConfigJson SecretType = "kubernetes.io/dockerconfigjson"

	// DockerConfigJsonKey is the key of the required data for SecretTypeDockerConfigJson secrets
	DockerConfigJsonKey = ".dockerconfigjson"

[nabokihms]

Let's leave a comment with the example of data.

[nabokihms]

In "kubernetes.io/dockercfg" there is no auth, we have to parse these two types differently.

[nabokihms]

NIT: it is better to use map[string]json.RawMessage