am 426ecc9e: SDK Updater: logic to load/save user sources and to delete them.

Merge commit '426ecc9efdf0b9562f9c53d3a9324b74c7b5dd70'

* commit '426ecc9efdf0b9562f9c53d3a9324b74c7b5dd70':
  SDK Updater: logic to load/save user sources and to delete them.