Chris Johns 3ddbd791b8 sb: Add an orphan check to sb-check.
The orphans check lets you see which configuration and build set
files in the RSB are not referernced. You can audit the list and
remove any configuration files not being used. Top level
build set files are included so you need to becareful not to
remove something that is valid and useful. To run:

 $ ./source-builder/sb-check --check-orphans
2018-01-18 13:16:47 +11:00
..
2018-01-18 13:16:47 +11:00
2012-11-06 10:09:40 +11:00