feature #523: Fixes some minor bugs for the fs drivers, and initialize source for images
feature #523: Image repository is now decopled from storage backend. Source is generated by drivers using a driver-specific URL.
feature #575: added error messages to image mad scripts
feature #575: Image drivers now uses scripts_common
feature #523: ImageManager and RequestManager integration
feature #523: Interation of the Image Manager with RM for allocate. Multiple bug fixes and integration issues
feature #523: New drivers for the Image Repository
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