[HADOOP-17463] Replace currentTimeMillis with monotonicNow in elapsed time - ASF JIRA

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I noticed that there is a widespread incorrect usage of System.currentTimeMillis() throughout the hadoop code.

For example:

// Some comments here
long start = System.currentTimeMillis();
while (System.currentTimeMillis() - start < timeout) {
  // Do something
}

Elapsed time should be measured using `monotonicNow()`.

is a parent of

YARN-10566 Elapsed time should be measured monotonicNow

links to

GitHub Pull Request #2615

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