public static List<UserPermission> getUserPermissions(Connection connection, String tableRegex,
    byte[] columnFamily, byte[] columnQualifier) throws Throwable {
    return getUserPermissions(connection, tableRegex, columnFamily, columnQualifier,
      HConstants.EMPTY_STRING);
  }
List all the userPermissions matching the given table pattern, column family and column
qualifier.
@param connection      Connection
@param tableRegex      The regular expression string to match against. It shouldn't be null,
                       empty or a namespace regular expression.
@param columnFamily    Column family
@param columnQualifier Column qualifier
@return List of UserPermissions
@throws Throwable on failure
hbase-client/src/main/java/org/apache/hadoop/hbase/security/access/AccessControlClient.java