kubeflow / tf-operator / 1798

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Improve meta information in log messages to make it easier to debug jobs (#765)

* Improve meta information in log messages to make it easier to debug jobs.

* Use <namespace>.<name> as opposed to <namespace>/<name>; the former
  is more consistent with K8s style.

* Add functions for constructing loggers for the pod and unstructured meta
  information. This will allow us to appropriately tag a number of log
  messages with meta information.

* Update a bunch of log messages which weren't logging info with
  appropriate meta information.

* Make json log formatting the default; this was the case for v1.
  json logging should be the default because otherwise we lose the meta
  information in the logs. With json logs its always possible to filter/reformat
  the log entries if you don't care about the metainformation.

Related to:
  #24 Use logrus
  #635

* Fix lint by running; goimports.

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