@Override
    public Set<Version> osVersions(Node host, int majorVersion) {
        return osVersions.stream().filter(v -> v.getMajor() == majorVersion).collect(Collectors.toUnmodifiableSet());
    }
Returns whether given behaviour is active for this invocation
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockHostProvisioner.java