pacific: os/bluestore: allow 'fit_to_fast' selector for single-volume osd

[ifed01]

backport of #50095

backport tracker: https://tracker.ceph.com/issues/59338
parent tracker: https://tracker.ceph.com/issues/57855

Signed-off-by: Igor Fedotov igor.fedotov@croit.io
(cherry picked from commit 25c8df3)

Conflicts:
src/os/bluestore/BlueStore.cc
Missing backport
Conflicts:
src/os/bluestore/BlueStore.cc
lacking another backport

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[sseshasa]

@ifed01 The following teuthology ObjectStore test https://pulpito.ceph.com/yuriw-2023-07-27_22:37:12-rados-wip-yuri6-testing-2023-07-24-0819-pacific-distro-default-smithi/7354890 failed.

The following tests failed: ObjectStore/StoreTestSpecificAUSize.SpilloverFixedTest and
ObjectStore/StoreTestSpecificAUSize.SpilloverFixed2Test. Can you please check and confirm if the failure is related to this PR?

I will remove the relevant test tag and 'needs-qa' label for now. Please add the 'needs-qa' label back once the PR is ready for a re-test.

Alternatively, if the failure is unrelated, a new tracker may be raised for the above failure and this PR may be merged. Please update accordingly.

[ifed01]

@sseshasa - I updated test cases in #51773 which is apparently a culprit for the teuthology failures. So both this PR and #51773 are ready for another QA round

[sseshasa]

@sseshasa - I updated test cases in #51773 which is apparently a culprit for the teuthology failures. So both this PR and #51773 are ready for another QA round

@ifed01 Sure, this and #51773 will go through another QA round.

[ljflores]

Rados approved: https://tracker.ceph.com/projects/rados/wiki/PACIFIC#httpstrellocomc8HALLv9T1813-wip-yuri6-testing-2023-08-03-0807-pacific-old-wip-yuri6-testing-2023-07-24-0819-pacific2-old-wip-yuri6-testing-2023-07-24-0819-p

[ljflores]

Rados approved: https://tracker.ceph.com/projects/rados/wiki/PACIFIC#httpstrellocomcTw3vOIOj1819-wip-yuri2-testing-2023-08-08-0755-pacific