Feature request: Disable node from scheduling new resources

[kvaps]

Sometimes I want to disable node from the scheduling new resources. It can be done using aux-properties and specifying --replicas-on-different, however it might be better to have native property to exclude node from the scheduling, and simple CLI command, eg:

linstor node disable <node>
linstor node enable <node>

It also can be connected with https://github.com/LINBIT/linstor-server/issues/220

linstor node evict <node>

will also automatically disable scheduling for it