qemumonitorjsontest: Allow deprecation of 'nbd-server-add' QMP command
qemumonitorjsontest: Allow deprecation of 'nbd-server-add' QMP command

qemu is going to deprecate this command in the next release. Allow this
as later patches will implement the use of replacement.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

nertpinx/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,jardasgit/libvirt,jardasgit/libvirt,olafhering/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,jardasgit/libvirt,crobinso/libvirt,jfehlig/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,libvirt/libvirt,jfehlig/libvirt