Deploy scrubber v2.0

Contains:

• Refactoring which changes the current deployment [1]
• Db upgrade script
• new 'swh scrubber' clis

Changes:

• configuration key change scrubber_db to scrubber
• bootstrap of ranges per object type (stored in db). It needs a cli to be called first to generate those.

Impacts:

• swh/infra/puppet/puppet-swh-site!633 (merged): swh-site: Adapt puppet manifests to account for changes
• swh-charts? (possibly in a dev branch)
• swh/devel/swh-scrubber!47 (merged): Fix debian build [2]

staging:

• scrubber0.staging: stop puppet
• scrubber0.staging: stop impacted services
• scrubber0.staging: Upgrade packages
• scrubber0.staging: Adapt config key so new cli is happy
• scrubber0.staging: Migrate db (swh db ...)
• scrubber0.staging: Apply puppet change (after ^ otherwise, services will restart without the db migrated)
• Restart services
• Checks

production:

• scrubber1: stop puppet
• scrubber1: stop impacted services
• scrubber1: Upgrade packages
• scrubber1: Adapt config key so new cli is happy
• scrubber1: Migrate db (swh db ...)
• scrubber1: Apply puppet change
• Restart services
• Checks

[1] swh/devel/swh-scrubber!43 (merged)

[2] https://jenkins.softwareheritage.org/view/swh-debian%20(draft)/job/debian/job/packages/job/DSCRUB/job/gbp-buildpackage/30/console