[FLINK-6351] [YARN] Refactoring YarnFlinkApplicationMasterRunner by c…

[rice668]

…ombining AbstractYarnFlinkApplicationMasterRunner in one class.

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[rice668]

cc @tillrohrmann

[shuai-xu]

There will soon be a YarnFlinkAppMaster extends AbstractYarnFlinkApplicationMasterRunner for flink yarn cluster mode, so need not combine them to one class.

[rice668]

Hey, @shuai-xu. Is there a corresponding JIRA for what you said ?

[tillrohrmann]

No longer valid because of the changes of Flip-6.