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Fixing warnings in cloudflared log collector.
This attempts to fix errors like the ones shown below:
```
diagnostic/diagnostic.go:132:23: Error return value of `logHandle.Close` is not checked (errcheck)
defer logHandle.Close()
diagnostic/diagnostic.go:134:26: G303: File creation in shared tmp directory without using ioutil.Tempfile (gosec)
outputLogHandle, err := os.Create(filepath.Join(os.TempDir(), logFilename))
```
## Summary
* The host log collector now verifies if the OS is linux and has systemd if so it will use journalctl to get the logs
* In linux systems docker will write the output of the command logs to the stderr therefore the function that handles the execution of the process will copy both the contents of stdout and stderr; this also affect the k8s collector
Closes TUN-8783
Miguel da Costa Martins Marcelino
Luis Neto