mgr/cephadm: handle setting required osd release with no OSDs during upgrade

mgr/cephadm: handle setting required osd release with no OSDs during upgrade

A change to the `ceph osd require-osd-release` command made it so
it fails if no OSDs are up unless --yes-i-really-mean-it is passed.
For real clusters this is likely not an issue, but it can be an
annoyance for trying upgrades on test clusters that may not have
OSDs deployed. This patch is to try and just pass the flag in cases
where we have no OSDs rather than failing the upgrade

Signed-off-by: Adam King <adking@redhat.com>
(cherry picked from commit 1033251fd3e021c92e0f407f63632b85073e4a36)