kubeflow / tf-operator / 941

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Use logrus for structured logging (#416)

* Move from glog to sirupsen/logrus for logging
* Add a new flag json_log_format
* Refactor all log statements to use logrus
* Use Info level for log level V(1) and below
* Use Debug level for log level V(2) and above
* Tested locally

Addresses https://github.com/kubeflow/tf-operator/issues/24

Sample logs
```
{"filename":"app/server.go:54","level":"info","msg":"EnvKubeflowNamespace not set, use default namespace","time":"2018-02-27T18:25:18-08:00"}
{"filename":"app/server.go:59","level":"info","msg":"[Version: 0.3.0+git Git SHA: Not provided. Go Version: go1.9.3 Go OS/Arch: darwin/amd64]","time":"2018-02-27T18:25:18-08:00"}
{"filename":"app/server.go:145","level":"info","msg":"No controller_config_file provided; using empty config.","time":"2018-02-27T18:25:18-08:00"}
{"filename":"controller/controller.go:110","level":"info","msg":"Setting up event handlers","time":"2018-02-27T18:25:18-08:00"}
```

20 of 20 new or added lines in 5 files covered. (100.0%)

444 of 1616 relevant lines covered (27.48%)

2.95 hits per line