Backup Bootstrap Improvements (microsoft#211)

* Backup Bootstrap Improvements
- add error notification for backups
- make set-x configurable for optional debug logging
- general refactoring
- switch mysql backup to single server with proxy support
- add backup file stats to logs
- add mysql port to default configs
- plumb mysql server ip, port and notification email to run-customization
- add Azure Cli 2 support
- add automatic provisioning of attached storage for Jumpbox
- add error handling for container creation

"prod deployment on Sep 5

"prod deployment on Aug 21

prod hotfix deployment on early Aug 2017 OpenedX on Azure (oxa).

prod deployment on 2017-08-03 OpenedX on Azure (oxa).

prod deployment on 2017-07-20 OpenedX on Azure (oxa).

 prod deployment on 2017-06-08 OpenedX on Azure (oxa).

First tag for oxa dev branches

minor prod deployment on 2017-04-24. Email content and styling. Opene…

…dX on Azure (oxa).

regular production deployment in mid-april 2017. OpenedX on Azure (oxa).