@Override
  public String toString() {
    return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
  }
Merge logs.
Child logs override a parent log of the same log id.

@param parentLogs  parent logs
@param childLogs   child logs
ambari-server/src/main/java/org/apache/ambari/server/stack/ComponentModule.java