* Added options to insert delays in backend tester
* Added wait delays to Azure and GoogleDrive to see it the CI is more stable with small delays
* Added more debug output to the backend tester
* Fixed dropbox reporting OAuth quota errors, when it is likely Dropbox API quota errors
* Implemented exception detection on AzureBlob backend
* Also showing sleep times in output
* Fixed a bug with the dropbox quota response
* Fixed error message to report correct number of files
* Fixed suppressed warning
