cephadm: add sudo ssh user option

cephadm: add sudo ssh user option

add the ability to use a non-root users for connecting to hosts, this user requires pass wordless sudo access

useful for clusters that have root ssh access disabled

Fixes: https://tracker.ceph.com/issues/44866
Signed-off-by: Daniel-Pivonka <dpivonka@redhat.com>
(cherry picked from commit 1052b9db7bdc50f61705e1f1331c5cbb20120586)