code: public String getAttribute(final SearchResult result, final String attributeName) throws NamingException {
          return getAttribute(result.getAttributes(), attributeName);
      }
docs: Retrieves an attribute by its name for the specified search result.
  @param result the search result of the entry to obtain the attribute value for
  @param attributeName the name of the attribute to return
  @return the value of the attribute, or null if not found
  @throws NamingException if an exception is thrown
  @since 1.4.0