Merge PR #40941 into master

* refs/pull/40941/head:
	qa/suites/rados/cephadm/smoke-roleless: test client-keyring
	qa/tasks/cephadm.py: adjust client.admin key mode; place on all hosts
	cephadm: distribute client.admin keyring+conf to label:_admin on bootstrap
	doc/cephadm: document the default 'admin' label
	mgr/cephadm: 'ceph orch client-keyring ...' commands to manage keyring files
	mgr/cephadm: reimplement ceph.conf pushing
	mgr/cephadm: use _write_remote_file for ceph.conf
	mgr/cephadm: _write_remote_file helper
	mgr/cephadm: add placementspec for which hosts get ceph.conf

Reviewed-by: Sebastian Wagner <swagner@suse.com>
Reviewed-by: Adam King <adking@redhat.com>

diff --cc qa/tasks/cephadm.py
Simple merge

diff --cc src/cephadm/cephadm
Simple merge

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

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

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

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