And move OSD API into separate package PVE::API2::CephOSD

To make it more usable on Andriod with Opaque.

There is enough space in the toolbar, so this is good enought for now.
Also remove some dead code, and re-ordered HDEdit to use both columns, which
looks better inside the CreateWizard.

//fixme : enable/disable splitbutton
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>

Make HA more stable if pmxcfs is not reachable for a short period (for example
if you restart the service). Some users reported they get empty VM list
when there is very high load on a server.

This is easier to read.

Our REST API cannot handle that.

tested with classic linux interfaces/bridge and openvswitch interfaces
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>