Restructure test directories and improve temp dir error handling

[mmulholla]

1. Restructured the directories.
2. Restructure required a minor change to the tmp directory processing, so I added extra error checking to temp directory processing based on previous comments. Basically now if the temp directory can't be created the current directory will be used as temp. Also if the log file fails to be created the log function will print to the console instead.
3. Note CreateTempDir is external - changes coming require that

[yangcao77]

why we need this extra else statement?
can pre-define the error

var err error
if _, err = os.Stat(tempDir); os.IsNotExist(err) {
	err = os.Mkdir(tempDir, 0755)
}
if err != nil {
	LogErrorMessage(fmt.Sprintf("Failed to create temp directory %s will use %s : %v", tempDir, tmpDir, err))
	// if cannot create subdirectory just use the base tmp directory
	tempDir = tmpDi
}

[mmulholla]

with your example if os.IsNotExist(err) returned true your second if would also return true which would be a bug. The else statement deals with errors which are not the os.IsNotExist(err) for example a permission error.

[yangcao77]

The second won't return true if os.Mkdir passes, err will be nil in this case

[mmulholla]

ah you removed my logic processing the os.Mkdir error, see where you are coming from now. Let me update it.

[mmulholla]

Updated

[yangcao77]

change looks good to me

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