progress: export stdout so it can be overridden by ubuntu-image #12025
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ubuntu-image has a
--quiet
flag that should suppress all output besides error messages. This is done per the Ubuntu CLI tool guidelinesWhen calling image.Prepare, there are two default outputs: "Fetching <snap_name>", and a progress bar for the download of the snap. The variable Stdout is already exported for the
image
package that prints the "Fetching" message. This PR exports the Stdout variable for theprogress
package as well so the progress bar can also be suppressed.