Simplifying Oversampling Mitigation

[atshaw43]

Issue #, if available:

Description of changes:
Simplifying Oversampling Mitigation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #356 (19c1c77) into master (5dce456) will decrease coverage by 0.14%.
The diff coverage is 51.42%.

@@             Coverage Diff              @@
##             master     #356      +/-   ##
============================================
- Coverage     58.54%   58.40%   -0.15%     
+ Complexity     1234     1223      -11     
============================================
  Files           133      132       -1     
  Lines          4986     4986              
  Branches        595      592       -3     
============================================
- Hits           2919     2912       -7     
- Misses         1793     1803      +10     
+ Partials        274      271       -3     

Impacted Files	Coverage Δ
...va/com/amazonaws/xray/contexts/SegmentContext.java	88.23% <ø> (ø)
...a/com/amazonaws/xray/entities/DummySubsegment.java	0.00% <0.00%> (ø)
...n/java/com/amazonaws/xray/entities/Subsegment.java	100.00% <ø> (+16.66%)	⬆️
...va/com/amazonaws/xray/entities/NoOpSubSegment.java	88.50% <40.00%> (-4.68%)	⬇️
...onaws/xray/contexts/ThreadLocalSegmentContext.java	72.91% <50.00%> (-1.56%)	⬇️
.../amazonaws/xray/contexts/LambdaSegmentContext.java	76.00% <55.55%> (-0.72%)	⬇️
...va/com/amazonaws/xray/entities/SubsegmentImpl.java	72.13% <85.71%> (+0.20%)	⬆️
.../main/java/com/amazonaws/xray/AWSXRayRecorder.java	63.58% <100.00%> (ø)
... and 1 more

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[wangzlei]

LGTM!