cli.admin: Add an admin subcommand 'deposit reschedule'
swh deposit admin deposit reschedule --help
That only reschedules loading for now.
This command is for admin use since it needs writable access to the db.
Annex:
- cli.admin: Fix help message typo
Depends on !25 (closed) Related #1703 (closed)
Test Plan
tox + docker dev
Migrated from D1447 (view on Phabricator)