public File getCommonWidgetsDescriptorFile() {
    return commonWidgetsDescriptorFile;
  }
Reads a Kerberos descriptor from the specified file path.

@param fileLocation the path to the file
@return a KerberosDescriptor or <code>null</code>, if no path is specified
@throws AmbariException if an error occurs reading or parsing the Kerberos descriptor file
ambari-server/src/main/java/org/apache/ambari/server/api/services/AmbariMetaInfo.java