* Add backup database metadata json rpc
* Backup database metadata changes after sync
* Changed request class name to BackupConfigInfo and made other changes
according to comments
* Addressed PR comments
* Initial checkin of backup service implementation
* Backup initial changes for the quick scenario
* misc changes
* Misc changes for backup in-progress work
* Add initial services for admin, tasks, and DR
* Fix up some of the contract interfaces
* Make fields public to allow Json.Net to work
* Fix a couple issues in backup contracts