cephadm: preserve authorized_keys file during upgrade

[mgfritch]

Fixes: https://tracker.ceph.com/issues/54530
Signed-off-by: Michael Fritch mfritch@suse.com

Checklist

• Tracker (select at least one)
  • References tracker ticket
  • Very recent bug; references commit where it was introduced
  • New feature (ticket optional)
  • Doc update (no ticket needed)
  • Code cleanup (no ticket needed)
• Component impact
  • Affects Dashboard, opened tracker ticket
  • Affects Orchestrator, opened tracker ticket
  • No impact that needs to be tracked
• Documentation (select at least one)
  • Updates relevant documentation
  • No doc update is appropriate
• Tests (select at least one)
  • Includes unit test(s)
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  • No tests

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[smithfarm]

Seems like a prudent policy

[mgfritch]

jenkins test api

[votdev]

LGTM

[adk3798]

http://pulpito.front.sepia.ceph.com/adking-2022-04-08_22:17:12-orch:cephadm-wip-adk-testing-2022-04-08-1434-distro-basic-smithi/

2 failures:

1 caused by https://tracker.ceph.com/issues/49287
workunits/cephadm/test_cephadm.sh failure caused by another PR in this run.