mgr/cephadm: do not refresh daemon and device inventory as often

mgr/cephadm: do not refresh daemon and device inventory as often

The device inventory rarely changes.

A daemon inventory of 60s may trigger every time around the loop when
doing upgrades, which is pretty slow (esp since it's currently done
synchronously).  We're doing a good job (I think?) of queueing refreshes,
so the only reason to time this data out is to catch daemon stops that
are caused by external factors.

Signed-off-by: Sage Weil <sage@redhat.com>