Merge pull request #45229 from adk3798/pacific-admin-drain

pacific: mgr/cephadm: block draining last _admin host

Reviewed-by: Michael Fritch <mfritch@suse.com>
Reviewed-by: Redouane Kachach <rkachach@redhat.com>

diff --cc src/pybind/mgr/cephadm/module.py
Simple merge

diff --cc src/pybind/mgr/orchestrator/_interface.py
Simple merge

diff --cc src/pybind/mgr/orchestrator/module.py
Simple merge