Wrap InterruptedException with an unchecked exception in TestSubscriber#awaitValueCount().

[vy]

In its current form, awaitValueCount() is the only TestSubscriber#await*method that throws a checked exception (that is, InterruptedException), whereas the others wrap it with a IllegalStateException. This spreads a try-catch disease throughout the entire code base where awaitValueCount() is used. One can argue that why not just declaring the exception in the caller method footprint: Because you might be implementing an interface (e.g. Runnable) which does not allow any exceptions in its footprint. This patch wraps the InterruptedException with an unchecked exception in TestSubscriber#awaitValueCount().

[codecov-io]

Current coverage is 84.25% (diff: 50.00%)

Merging #4453 into 1.x will increase coverage by 0.01%

@@                1.x      #4453   diff @@
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  Files           271        271          
  Lines         17599      17602     +3   
  Methods           0          0          
  Messages          0          0          
  Branches       2683       2683          
==========================================
+ Hits          14825      14831     +6   
  Misses         1915       1915          
+ Partials        859        856     -3   

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[akarnokd]

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