mgr/cephadm: fixing logging output for rm-cluster operation

[rkachach]

Let's use the recently added support to configure cephadm output (when using as standard binary) for rm-cluster operation also. This way user will see warnings/errors generated during this op.

Fixes: https://tracker.ceph.com/issues/51671
Signed-off-by: Redouane Kachach rkachach@redhat.com

Related PRs:
#45685

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[adk3798]

https://pulpito.ceph.com/adking-2022-04-22_01:18:37-orch:cephadm-wip-adk-testing-2022-04-21-1828-distro-basic-smithi/

2 Failures inferring config in tests using docker, caused by another PR in the run.