public void remove(List<KerberosPrincipalEntity> entities) {
    if (entities != null) {
      for (KerberosPrincipalEntity entity : entities) {
        remove(entity);
      }
    }
  }
Tests the given principal name to see if it already exists.

@param principalName name of kerberos principal to find
@return true if the principal exists; false otherwise
ambari-server/src/main/java/org/apache/ambari/server/orm/dao/KerberosPrincipalDAO.java