osd: do not assert on fast shutdown timeout

[ifed01]

Fixes: https://tracker.ceph.com/issues/61140

Signed-off-by: Igor Fedotov igor.fedotov@croit.io

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[ljflores]

@ifed01 see #53754 (comment)

[github-actions]

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

[ifed01]

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[ifed01]

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[pdvian]

RADOS approved: https://tracker.ceph.com/projects/rados/wiki/MAIN#httpspulpitocephcomyuriw-2023-10-24_001103-rados-wip-yuri2-testing-2023-10-23-0917-distro-default-smithi