2.x: Reactive-Streams 1.0.2-RCx - not for merge

[akarnokd]

This PR verifies the upcoming Reactive-Streams 1.0.2 with TCK changes are still okay with RxJava.

[codecov]

Codecov Report

Merging #5752 into 2.x will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5752      +/-   ##
============================================
- Coverage     96.32%   96.28%   -0.04%     
+ Complexity     5842     5836       -6     
============================================
  Files           634      634              
  Lines         41650    41653       +3     
  Branches       5769     5769              
============================================
- Hits          40120    40107      -13     
- Misses          600      607       +7     
- Partials        930      939       +9

Impacted Files	Coverage Δ	Complexity Δ
...a/io/reactivex/internal/util/QueueDrainHelper.java	58.86% <0%> (-5.68%)	31% <0%> (-4%)
...rnal/subscribers/SinglePostCompleteSubscriber.java	94.87% <0%> (-5.13%)	14% <0%> (-1%)
...l/operators/observable/ObservableFlatMapMaybe.java	89.54% <0%> (-3.27%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	93.47% <0%> (-3.27%)	2% <0%> (ø)
...activex/internal/observers/QueueDrainObserver.java	61.53% <0%> (-2.57%)	12% <0%> (-1%)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...ex/internal/subscribers/InnerQueuedSubscriber.java	96.07% <0%> (-1.97%)	18% <0%> (-1%)
.../io/reactivex/disposables/CompositeDisposable.java	97.24% <0%> (-1.84%)	39% <0%> (-1%)
...rnal/subscriptions/DeferredScalarSubscription.java	98.46% <0%> (-1.54%)	28% <0%> (-1%)
...vex/internal/operators/flowable/FlowableCache.java	92.61% <0%> (-1.35%)	7% <0%> (ø)
... and 29 more

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