Add some high-level comments to DeviceFactory.configure_device.
Add some high-level comments to DeviceFactory.configure_device.

rhinstaller/blivet,rvykydal/blivet,rhinstaller/blivet,dwlehman/blivet,rvykydal/blivet,vojtechtrefny/blivet,dwlehman/blivet,jkonecny12/blivet,jkonecny12/blivet,AdamWill/blivet,AdamWill/blivet,vpodzime/blivet,vojtechtrefny/blivet,vpodzime/blivet