public MockHostProvisioner without(Behaviour first, Behaviour... rest) {
        behaviours.remove(first);
        for (var b : rest) {
            behaviours.remove(b);
        }
        return this;
    }
Returns the number of hosts deprovisioned by this
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockHostProvisioner.java