2.x: Expose the Keep-Alive value of the IO Scheduler as System property. (#6279)

[pawellozinski]

Configuring Keep-Alive through System property.

Resolves: #6279

[codecov]

Codecov Report

Merging #6287 into 2.x will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x    #6287      +/-   ##
============================================
+ Coverage     98.25%   98.29%   +0.03%     
+ Complexity     6262     6261       -1     
============================================
  Files           667      667              
  Lines         44888    44889       +1     
  Branches       6214     6214              
============================================
+ Hits          44105    44122      +17     
+ Misses          249      236      -13     
+ Partials        534      531       -3

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/schedulers/Schedulers.java	100% <ø> (ø)	10 <0> (ø)	⬇️
.../io/reactivex/internal/schedulers/IoScheduler.java	91.48% <100%> (+1.16%)	9 <0> (ø)	⬇️
...va/io/reactivex/internal/queue/SpscArrayQueue.java	97.61% <0%> (-2.39%)	22% <0%> (-1%)
...x/internal/operators/flowable/FlowablePublish.java	96.59% <0%> (-2.13%)	11% <0%> (ø)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	93.23% <0%> (-1.94%)	2% <0%> (ø)
.../io/reactivex/disposables/CompositeDisposable.java	98.14% <0%> (-1.86%)	39% <0%> (-1%)
...perators/mixed/ObservableSwitchMapCompletable.java	98.94% <0%> (-1.06%)	3% <0%> (ø)
.../operators/mixed/FlowableConcatMapCompletable.java	99.14% <0%> (-0.86%)	2% <0%> (ø)
...nternal/operators/observable/ObservableCreate.java	97.43% <0%> (-0.86%)	2% <0%> (ø)
...vex/internal/operators/flowable/FlowableCache.java	97.72% <0%> (-0.76%)	37% <0%> (-1%)
... and 22 more

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