API: OSD: Fix #2496 Check OSD Network

API: OSD: Fix #2496 Check OSD Network

It's possible to have a situation where the cluster network (used for
inter-OSD traffic) is not configured on a node. The OSD can still be
created but can't communicate.

This check will abort the creation if there is no IP within the subnet
of the cluster network present on the node. If there is no dedicated
cluster network the public network is used as a failsafe even though
this situation should not occur.

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>