endpoint case

In windows the case is not a big deal but in linux systems, sometimes they
expect uppercase. So i changed the following in DcerpcBinding.java to allow that
uppercase string to reach them:

From:

void setOption(String key, Object val) throws DcerpcException {
  if (key.equals("endpoint")) {
    endpoint = val.toString().toLowerCase();
      if (endpoint.startsWith("\\pipe\\")) {
        String iface = (String)INTERFACES.get(endpoint.substring(6));

 
To:
 
void setOption(String key, Object val) throws DcerpcException {
  if (key.equals("endpoint")) {
    // VNA: forcefully transforming the endpoint into lowercase limits the
choice of the library's user.
    // Changing it here so that the developer gets  to make that choice.
    endpoint = val.toString();
    if (endpoint.toLowerCase().startsWith("\\pipe\\")) {
      String iface = (String)INTERFACES.get(endpoint.toLowerCase().substring(6));