Create generic function to DRY up parsing log output data

[seanmcgary]

Currently we have a lot of functions that look like this and are very similar:

func parseLogOutputForPodSharesUpdatedEvent(outputDataStr string) (*podSharesUpdatedOutputData, error) {
	outputData := &podSharesUpdatedOutputData{}
	decoder := json.NewDecoder(strings.NewReader(outputDataStr))
	decoder.UseNumber()

	err := decoder.Decode(&outputData)
	if err != nil {
		return nil, err
	}
	return outputData, err
}

We should be able to refactor this into a generic function that takes the desired destination struct and decodes the JSON into it.