Fix #2053: OSD destroy only on specified node

Fix #2053: OSD destroy only on specified node

Allow destroying only OSDs that belong to the node that has been specified in
the API path.

So if
 - OSD 1 belongs to node A and
 - OSD 2 belongs to node B
then
 - pvesh delete nodes/A/ceph/osd/1 is allowed but
 - pvesh delete nodes/A/ceph/osd/2 is not

Destroying an OSD via GUI automatically inserts the correct node
into the API path.

pveceph automatically insert the local node into the API call, too.
Consequently, it can now only destroy local OSDs (fix #2053).
 - pveceph osd destroy 1 is allowed on node A but
 - pveceph osd destroy 2 is not

Signed-off-by: Dominic Jäger <d.jaeger@proxmox.com>