[FLINK-18191] Rename jobmanager.memory.* configuration options into master.memory.*

[tillrohrmann]

This commit renames the jobmanager.memory.* config options into master.memory.* to
align it better with the overall Flink terminology.

cc @zentol.

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[zentol]

+1

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[tillrohrmann]

Thanks for the quick review @zentol. Unfortunately, there is currently a discussion about renaming the "Flink Master" back into the "JobManager" again. Until this discussion is resolved, we need to put this effort on halt, unfortunately.

[zentol]

@tillrohrmann Where is this discussion? I only saw one comment by @aljoscha in FLINK-18209.

[aljoscha]

https://lists.apache.org/thread.html/red9d18f7173d53d016f6826410841b2726b9293ceefaea2de0cdeafb%40%3Cdev.flink.apache.org%3E

[tillrohrmann]

Closing this PR since it seems to be no longer relevant.