Replace use of foreign sources with descriptors and describable
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Upstream-commit: 2c60430a3d1431e0879aa1c66ca23143de987b35
Component: engine
This is used to support downloading Windows base images from Microsoft
servers.
Signed-off-by: John Starks <jostarks@microsoft.com>
Upstream-commit: 05bd04350b8348b3c3bbe3156420257313e4e804
Component: engine
