public MockHostProvisioner with(Behaviour first, Behaviour... rest) {
        behaviours.put(first, Integer.MAX_VALUE);
        for (var b : rest) {
            behaviours.put(b, Integer.MAX_VALUE);
        }
        return this;
    }
Returns the number of hosts deprovisioned by this
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockHostProvisioner.java