static String[] getEnabledProtocols(SSLConfig config) {
    List<String> enabledProtocols = Utils.splitString(config.sslEnabledProtocols, ",");
    return !enabledProtocols.isEmpty() ? enabledProtocols.toArray(new String[0]) : null;
  }
@param config the {@link SSLConfig}.
@return the list of supported cipher suites, or {@code null} if the configs did not specify any
ambry-commons/src/main/java/com/github/ambry/commons/NettySslFactory.java