mgr/cephadm: Show warning when user provides --fsid option

[rkachach]

Fixes: https://tracker.ceph.com/issues/50804

Signed-off-by: Redouane Kachach rkachach@redhat.com

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[mgfritch]

maybe this should be an error if the specified fsid already exists?

[rkachach]

Updated the code to show an explicit error if a cluster with the same fsid already exists.

[phlogistonjohn]

lgtm

[adk3798]

http://pulpito.front.sepia.ceph.com/adking-2022-03-29_23:26:23-orch:cephadm-wip-adk-testing-2022-03-29-1402-distro-basic-smithi/

Failures:
https://tracker.ceph.com/issues/44587
https://tracker.ceph.com/issues/49287
1 machine failed to install kernel fast enough