Making TraceKeys a deprecated, package scope detail of legacy sleuth parsers

[marcingrzejszczak]

fixes gh-940

[codecov-io]

Codecov Report

Merging #942 into master will increase coverage by 0.81%.
The diff coverage is 87.17%.

@@             Coverage Diff              @@
##             master     #942      +/-   ##
============================================
+ Coverage     70.32%   71.13%   +0.81%     
+ Complexity      623      618       -5     
============================================
  Files           121      121              
  Lines          2881     2751     -130     
  Branches        280      280              
============================================
- Hits           2026     1957      -69     
+ Misses          682      621      -61     
  Partials        173      173

Impacted Files	Coverage Δ	Complexity Δ
...loud/sleuth/autoconfig/TraceAutoConfiguration.java	92.3% <ø> (ø)	15 <0> (ø)	⬇️
...uth/instrument/web/TraceHttpAutoConfiguration.java	93.33% <ø> (ø)	9 <0> (ø)	⬇️
...uth/instrument/rxjava/RxJavaAutoConfiguration.java	100% <100%> (ø)	2 <1> (ø)	⬇️
.../sleuth/instrument/web/SleuthHttpServerParser.java	61.9% <100%> (-4.77%)	8 <0> (ø)
...h/instrument/scheduling/TraceSchedulingAspect.java	83.33% <100%> (-2.39%)	4 <1> (ø)
...loud/sleuth/instrument/async/TraceAsyncAspect.java	95.23% <100%> (-0.6%)	5 <1> (ø)
...nstrument/async/AsyncDefaultAutoConfiguration.java	100% <100%> (ø)	3 <1> (ø)	⬇️
.../instrument/rxjava/SleuthRxJavaSchedulersHook.java	78.57% <100%> (-1.43%)	5 <2> (ø)
.../cloud/sleuth/instrument/hystrix/TraceCommand.java	92.3% <100%> (-1.81%)	2 <0> (ø)
...t/scheduling/TraceSchedulingAutoConfiguration.java	100% <100%> (ø)	2 <0> (ø)	⬇️
... and 4 more

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