[PR] AMBARI-26536: Support hadoop credential provider for AMS [ambari-metrics]

["develop-vijay (via GitHub)" <gi...@apache.org>]

develop-vijay opened a new pull request, #171:
URL: https://github.com/apache/ambari-metrics/pull/171

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   ## What changes were proposed in this pull request?
   
   Support hadoop credential provider for AMS
   
   ## How was this patch tested?
   
   Test 1:
   
   1. Created a new credential store with keystore password
   2. Configured ```hadoop.security.credential.provider.path``` in ams-site.xml to point to jceks path. Ex: jceks://file/tmp/test.jceks
   3. Started the AMS service to observe the passwords are read from cred store
   
   Test 2:
   
   1. Created a new credential store with keystore password
   2. Configured ```hadoop.security.credential.provider.path``` in ams-site.xml to point to jceks path. Ex: jceks://file/tmp/test.jceks
   3. Passwords are present in cred store
   4. Started the AMS service to observe the passwords are read from AMS configuration file directly
   
   Test 3:
   
   1. Created a new credential store with keystore password
   2. Credential store not configured
   3. Started the AMS service to observe the passwords are read from AMS configuration file directly
   
   
   Please review [Ambari Contributing Guide](https://cwiki.apache.org/confluence/display/AMBARI/How+to+Contribute) before opening a pull request.
   


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