(2.13) hotplug: Use QMP during HotDelDevice
(2.13) hotplug: Use QMP during HotDelDevice

During device hot-del use new QMP helper methods: HotDelDisk() for
disk hotplug and HotDelNic() for NIC hotplug.

Signed-off-by: Dimitris Aragiorgis <4514117c4a99256e19437c7e3407c4ecbf98aec0@grnet.gr>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

apyrgio/snf-ganeti,apyrgio/snf-ganeti