[CHEF-4456] Created some tests for CookbookSiteStreamingUploader#create_build_dir method
[CHEF-4456] Created some tests for CookbookSiteStreamingUploader#make_request
[CHEF-4456] Created some tests for CookbookSiteStreamingUploader#StreamPart
[CHEF-4456] Created some tests for CookbookSiteStreamingUploader#StringPart
[CHEF-4456] Created some tests for CookbookSiteStreamingUploader#MultipartStream