Drop scheduler updater references

Related to D2354 Related to D2358

Test Plan

bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to drop_scheduler_updater saatchi
Found host saatchi.internal.softwareheritage.org
Cloning into '/tmp/swh-ocd.yoUZ8dks/environments/production/data/private'...
done.
Cloning into '/tmp/swh-ocd.yoUZ8dks/environments/drop_scheduler_updater/data/private'...
done.
*** Running octocatalog-diff on host saatchi.internal.softwareheritage.org
I, [2019-11-26T17:19:50.958101 #24389]  INFO -- : Catalogs compiled for saatchi.internal.softwareheritage.org
I, [2019-11-26T17:19:51.961434 #24389]  INFO -- : Diffs computed for saatchi.internal.softwareheritage.org
diff origin/production/saatchi.internal.softwareheritage.org current/saatchi.internal.softwareheritage.org
*******************************************
- File[/etc/softwareheritage/backend/ghtorrent.yml]
*******************************************
- File[/etc/softwareheritage/backend/scheduler-updater-writer.yml]
*******************************************
- File[/etc/softwareheritage/backend/scheduler-updater.yml]
*******************************************
- File[/etc/systemd/system/ssh-ghtorrent.service]
*******************************************
- File[/etc/systemd/system/swh-scheduler-updater-consumer-ghtorrent.service]
*******************************************
- File[/etc/systemd/system/swh-scheduler-updater-writer.service]
*******************************************
- File[/etc/systemd/system/swh-scheduler-updater-writer.timer]
*******************************************
- File[/home/swhscheduler/.ssh/id-rsa-swh-ghtorrent]
*******************************************
- Package[autossh]
*******************************************
- Package[python3-swh.scheduler.updater]
*******************************************
- Service[ssh-ghtorrent]
*******************************************
- Service[swh-scheduler-updater-consumer-ghtorrent]
*******************************************
- Service[swh-scheduler-updater-writer.service]
*******************************************
- Service[swh-scheduler-updater-writer.timer]
*******************************************
- Systemd::Unit_file[ssh-ghtorrent.service]
*******************************************
- Systemd::Unit_file[swh-scheduler-updater-consumer-ghtorrent.service]
*******************************************
- Systemd::Unit_file[swh-scheduler-updater-writer.service]
*******************************************
- Systemd::Unit_file[swh-scheduler-updater-writer.timer]
*******************************************
*** End octocatalog-diff on saatchi.internal.softwareheritage.org

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Migrated from D2359 (view on Phabricator)