## What is the purpose of the change

See. [FLINK-5542](https://issues.apache.org/jira/browse/FLINK-5542)

use YarnCluster vcores setting to do MaxVCore validation instead of using the 
local yarn conf.


## Brief change log

- *Fetch MaxVCore num via yarnClient instead of using the local yarn conf*

## Verifying this change

This change is a trivial rework / code cleanup without any test coverage.
But I already reproduced the 
[Error/Exception](http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/1-1-4-on-YARN-vcores-change-td11016.html),
 after the fix, it's working as expected.
        

## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency): (no)
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
  - The serializers: (no)
  - The runtime per-record code paths (performance sensitive): (no)
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
  - The S3 file system connector: (no)

## Documentation

  - Does this pull request introduce a new feature? (no)
  - If yes, how is the feature documented? (not documented)


[ Full content available at: https://github.com/apache/flink/pull/6775 ]
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