[AMBARI-26027]:fix no data is available for monitoring indicators of components…

[452926826]

… such as hdfs and yarn on the web page

What changes were proposed in this pull request?

i have changed the java file(ambari-metrics-timelineservice\src\main\java\org\apache\ambari\metrics\core\timeline\discovery\TimelineMetricMetadataKey.java),there are two methods were modified: equals and hashcode

How was this patch tested?

i run this command （mvn clean package -Dbuild-rpm -DskipTests -Djdk.version="1.8" -T 1C）to package ambari-metrics project, and replace ambari-metrics-timelineservice.jar in the /usr/lib/ambari-metrics-collector/ directory,then restart ambari-web

Please review Ambari Contributing Guide before opening a pull request.

[452926826]

the issues link is:[https://issues.apache.org/jira/browse/AMBARI-26027]