Tests should not rely upon wall clock time [LUCENE-4213]

I commented out these checks in #5284: but we should really fix tests that do this.

It makes them hard/impossible to reproduce when they fail.

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Migrated from [LUCENE-4213](https://issues.apache.org/jira/browse/LUCENE-4213) by Robert Muir (@rmuir)

Start with the checks commented out in #5284 and trace the related Lucene tests that rely on wall-clock time. Identify each affected test and determine how its timing assumptions can be made reproducible. Done means the tests no longer depend on wall-clock timing and failures can be reproduced reliably.

Written by the indexing model from the issue text.