private void removeConfigTypeProp(HashMap<String, Collection<String>> configurations, String configType, String prop) {
    Collection<String> configTypeProps = configurations.get(configType);
    if (configTypeProps == null) {
      configTypeProps = new HashSet<>();
      configurations.put(configType, configTypeProps);
    }
    configTypeProps.add(prop);
    actionLog.writeStdOut(String.format("Removing property %s/%s", configType, prop));
  }
Removes a property from the set of properties of a given service config type

@param configurations a map of configurations
@param configType     service config type
@param prop           property to be removed
ambari-server/src/main/java/org/apache/ambari/server/serveraction/kerberos/UpdateKerberosConfigsServerAction.java