iop: set-feed-rev: Add cmd for setting feed revisions
Add scripts that, given one or more feeds and optional git commit reference for each feed, updates feeds.conf.io and yml-profiles in profiles.
By default, a commit with auto-generated commit message is created. Options are available to push the resulting commit directly or as a GitLab MR.
Signed-off-by: Andreas Gnau andreas.gnau@iopsys.eu