Logging: Avoid uuids in field names

[barkbay]

We have at least one log statement, at the debug level, which can generate fields with "random" names:

cloud-on-k8s/pkg/controller/common/watches/handler.go

Lines 61 to 63 in e9681fe

	if !exists {
	log.V(1).Info("Adding new handler registration", "key", handler.Key(), "current_registrations", d.registrations)
	}

This may for example produce the following log:

"current_registrations": {
      "my-project-1-es-referenced-secrets": {
        "Watcher": {
          "Namespace": "my-project-1",
          "Name": "es"
        },
        "Watched": [
          {
            "Namespace": "my-project-1",
            "Name": "watched-resource1"
          },
          {
            "Namespace": "my-project-1",
            "Name": "watched-resource2"
          }
        ],
        "Name": "my-project-1-es-referenced-secrets"
      },
      "my-project-2-es-referenced-secrets": {
        "Watcher": {
          "Namespace": "my-project-2",
          "Name": "es"
        },
        "Watched": [
          {
            "Namespace": "my-project-2",
            "Name": "watched-resource1"
          },
          {
            "Namespace": "my-project-2",
            "Name": "watched-resource2"
          }
        ],
        "Name": "my-project-2-es-referenced-secrets"
      },
     .... lots of other fields ...

This can lead to a "mapping explosion" situation.