proposal: deprecate -readconfig/-writeconfig

[Paolo Bonzini]

IMHO configuration files are in general a failed experiment.  In
practice, they do not add much value over just a shell script because
they don't allow configuring all QEMU options, they are very much fixed
(by their nature).  I think it's more or less agreed that they are not
solving any problem for higher-level management stacks as well; those
would prefer to configure the VM via QMP or another API.

So, any objections to deprecating -readconfig and -writeconfig?

Thanks,

Paolo